(There is a raceway milled inside the receiver to provide clearance for the finger lever's tip so it moves freely while manipulating the bolt.) I have a newer 6.5 Grendel and the second round from the mag wont go into battery. There is an aftermarket bolt and lockback adapter combination from Custom Shooting technologies that BigG mentioned but it's a $190 worth of convenience. AR 15: Quick and Easy Bolt Hold Open Repair. It won't stay open after the last shell is fired either. The lever makes contact in only six areas: the trigger safety block, the locking bolt, the plunger, the finger lever screw, the carrier, and the bolt. I can pull it back by hand but it just springs shut when I release the bolt handle. If I put an empty mag in it will catch on the mag like it is supposed to and lock but as soon as I hit the Is the cartridge stop sticking out of the receiver when unloaded?. It rotates approximately 15 degrees to lock and unlock inside the chamber. Check to make sure the gas tube in the gun is not bent and binding on the bolt carrier key. This no matter what setting on the adjustable gas block? Re: Help: AR15 Bolt not locking back on last round with the M4 stock, you should have a carbine buffer and spring. If the spring and assembly is in place and the bolt carrier will come off the rails by drawing the charging handle back, its not right. The action on an 1100 and 11-87 is to always lock back after every shot. Drop the firing pin into the bolt carrier from the rear, making sure it is completely seated, then replace the cotter pin from left to right. Take off the stock, loosen the castle nut, and unscrew the buffer tube. The extractor hooks the rim of each round, capturing it and pulling it out of the star chamber after firing. The fit and finish looks excellent and it works, but the bolt will not lock after the last round. The need for a heavy bolt carrier is instantly myth busted once your are able to adjust the gas pressure and balance the system. Put the good Bolt Not Locking Back - Could be a lot of if same issue then look at gas block for alignment. Check Your Gas Rings. Is the cartridge stop sticking out of the receiver when unloaded?. I pulled on the changing handle so hard I thought I was going to break When you are dropping the 2nd shell is it falling out the bottom?. Description. Locate the bolt hold open lever and examine it thoroughly. FiremanBob, Although this is not my first 10//22, I am always eager to learn. I replaced the rifle buffer with a nice JP captured spring buffer and still no dice. This over-travel condition allows the 9MM AR Bolt to travel too fast in the forward direction causing premature failure of the bolt catch. If everything is new I'd run up to 50 rounds through to see if anything simply loosens up.. you're welcome to come use by buffer, spring, BCG, etc if you don't have a spare but that's the next step just start swapping out what This is No. Place the If it is working correctly, it should move freely when manipulated and easily lock into place in order to hold the bolt in the open position. Put an empty mag in the rifle, pull back the charging handle. Make sure the corners are round and smooth. To perform an empty reload when the bolt is locked to the rear, its best to use the bolt catch as a bolt release. 300 BO with a standard spring, buffer, M16 carrier and 9 barrel should work Nothing holds the carrier latch to the rear position when shell hits it. PA-10 Bolt won't lock back. 100% Lifetime Warranty against manufacturers defects. Will also add: just tested and learned bolt does not lock back on an empty magazine (and does not lock back when there is no magazine). 0. The main cause of this is dry firing without the bolt and carrier in place. Since Aaron's MAS-49/56 had been rechambered to 7.62x51mm NATO, and we wanted to verify the listed velocity for the 7.5x54mm, this gave our friend Tom Adams an excuse to buy one of the MAS-36 bolt-action rifles for his collection. C Texan. Courtesy Firearms History. (There is a raceway milled inside the receiver to provide clearance for the finger lever's tip so it moves freely while manipulating the bolt.) Finished out the clays round by switching back and forth my cousins Inertia Driven Franchi. AR-15s run with no lube can have too great of friction, thus causing the bolt to fail to travel all the way to the rear. This happens about 90% of the time. #15. Usually it is just a bad magazine spring that is not pushing with enough pressure to engage the bolt stop. 3. 1. I then experienced failure to feed, bolt would not lock back and carrier was in the up position even after the Cartridge Drop Lever was depressed. Fun Gun Reviews Presents: "How the AR 15 Bolt Carrier Group Works". The main cause of this is dry firing without the bolt and carrier in place. After firing my last round instead of locking back, the bolt carrier goes back foward resulting in a dry fire. This is a common mod among SKS owners with no known draw backs that I have found. Eventually, things wear out and rust. That would have to do with the cartridge stop. Reason One A 9MM AR Bolt is shorter than a milspec AR-15 Bolt Carrier Group. It started a bit after removing the long mag tube, and reinstalling the original spring and cap. Put an empty mag in the rifle, pull back the charging handle. Theoretically it should fire as soon as the bolt locks. Basically it pushes the bolt back against the lugs. Also, about 10% of the time the bolt will not even cycle a new round. I have to totally take the upper off the lower and either use a flat head screw driver or a thick knife to pry the bolt assembly back. Two Reasons a 9MM AR Bolt Catch Breaks. I then experienced failure to feed, bolt would not lock back and carrier was in the up position even after the Cartridge Drop Lever was depressed. Then place the Bolt Face on the flat surface with the Carrier also in a vertical position. I been messing around with an adjustable gas block, but the thing seems to only want to lock back after last round on the carrier. I still can't get the bolt carrier and bolt out of the upper. Then place the Bolt Face on the flat surface with the Carrier also in a vertical position. SamLS. If it is working correctly, it should move I would try, in order, buffer spring and then measuring the seat depth of the fully inserted magazine. It strips, chambers, and drops the hammer, but only leaves a light strike on the primer. 3. This no matter what setting on the adjustable gas block? The case wound up being stuck in the chamber (it didn't burst or anything, but was stuck in there pretty good). Look at the Carrier Latch, 97010C, item 24 on the parts list. Tank56. Re: Help: AR15 Bolt not locking back on last round with the M4 stock, you should have a carbine buffer and spring. All the experts will point out that this is also a cause of bolt lock-back failure. Once the bolt is held open, drop the magazine. If the Bolt Carrier weight alone causes the Carrier to fall down on the Bolt change the Gas Rings. Insert a loaded mag and rack. Fire that round and look to see if the bolt face is locked behind the stop. A practical but unscientific test is to press the bolt into the carrier, hold the bolt carrier group (BCG) in the air by the bolt and observe whether it slides Ammo marked 5.56 is hotter. Recently it has occaisionally been locking back with a shell on the carrier. It's not my first 10/22, and I have never had this happen before. I've posted several of my difficulties with the 15-22 I purchased in Nov 2018 - here's another one - the Bolt Carrier won't remain open upon last My guess - looking at similar problems Google has shown me - is that the Magpul UBR stock installed by the previous owner is too short and/or doesn't have the right buffer and/or spring. I pulled on the changing handle so hard I thought I was going to break it. Feb 3, 2020. Then when a shell is released form the magazine tube the back of the shell hits a shell release lever which releases the bolt and chambers the 10/22s are not designed to lock back on the last round and Ruger never made that a feature. This has nothing to do with your gas system if it is ejecting and locking back okay. If you have the gas turned too low it will not cycle the carried back far enough to lock the bolt back. The need for a heavy bolt carrier is instantly myth busted once your are able to adjust the gas pressure and balance the system. Not_a_tackdriver. If it just sits there, with the hammer in the depression in the bolt behind the bolt head. Answer (1 of 20): Like others whove already answered, I have to go with, It depends. If Im just pulling it out of the case and loading it for the first time? This happens with all four of my magazines. 3. If you have dry fired the gun, with the trigger out, the shoulder on this part wears and will cause the basic symtom you described. The carrier latch is jammed or the carrier is not moving fully because of the shell latch not being staked in place. The bolt will not stay locked in the open position. if same issue then look at gas Downside is the Guard bolt and barrel are proprietary. Put the good carrier bolt in the bad carrier and the results were the Check your gas rings and be sure they haven't wandered around and lined up and/or broke, etc.. check your carrier key and be sure it's tight. #2/13. within the receiver. If this is the problem, the fix is fairly cheap and simple. #15. If the catch does not work with an empty mag, I suspect the part of the catch that stops the bolt is broken off. So the bolt catch grabs the carrier and not the bolt face correct? When you are dropping the MMDAVI14. Extend the Bolt all the way forward in the Carrier. If the bolt doesn't lock back you can see if the gun is short stroking. All 8.5 10-bolt rears have two squared-off ears at the 4 and 6-oclock on the bottom of the pumpkin, that is the #1 tell-tale sign, if you dont have those, you dont have an 8.5 10-bolt. I removed the casing and re-assembled. I believe it's called the bolt carrier group, if not please correct me. That worked fine and the bolt stays locked back. I've posted several of my difficulties with the 15-22 I purchased in Nov 2018 - here's another one - the Bolt Carrier won't remain open upon last round fired from the mag. This could be: - short recoil: the bolt does not recoil far enough back to clear the hold open - improper action of the bolt hold-open: Something else i tried, thinking the issue may be gas related, is locking the bolt back, holding the trigger and releasing the bolt catch. Good Luck. Bolt assembly will not go completely forward at all. Look at the Carrier Latch, 97010C, item 24 on the parts The bolt and carrier should be somewhat clean, but more importantly well oiled. February 16th, 2011, 09:49 AM #5 TJB63 Super Member Join Date Apr 2007 Location not cycling far enough back. Drop the bolt and put pressure on the bolt stop to the up side. Bolt Not Locking Back - Could be a lot of things. AR 15: Quick and Easy Bolt Hold Open Repair. If you have dry fired the gun, with the trigger out, the shoulder on this part wears and will cause the basic symtom you described. Ar 15 bolt not locking back New Bushmaster 90629 Predator 5+1 223REM/5.56NATO 20" Flat-Top Bolt only went 3/4's of the way back ten times. When you pull the bolt back looking in the bottom does the bolt lock spring out in the back?. Sadly that did not achieve a released bolt. The need for a heavy bolt carrier is instantly myth busted once your are able to adjust the gas pressure and balance the system. Too Little Gas - This will cause short stroking, double feeds, failures to feed/extract/lock-back, and stovepipes. This over-travel condition allows the 9MM AR Bolt to travel too fast in the forward direction causing premature failure of the bolt catch. AR 15: Quick and Easy Bolt Hold Open Repair. I have tried multiple mags, and 2 different FiremanBob, Although this is not my first 10//22, I am always eager to learn. Save. The image below gives a nice breakdown of the parts in a typical BCG. If the latch is not flush with the side of the receiver it can restricted movement of other parts in the receiver. Basically, when running with the suppressor on, the bolt doesn't lock back on an empty magazine. If the bolt does not line up correctly, explosive pressure from the cartridge can blow the bolt back, causing a backfire and severe injuries to the shooter. As the bolt carrier group moves rearward, it engages the Only show this user. Removing the ledges makes the bolt narrow enough to fit between the lips of the magazine. That will tell you if you have enough gas running the gun. Try adding a little bit more gas and see if that fixes the issue. Insert a empty mag and charge the weapon, the BCG should remain back. Two Reasons a 9MM AR Bolt Catch Breaks. Ar 15 bolt not locking back New Bushmaster 90629 Predator 5+1 223REM/5.56NATO 20" Flat-Top Bolt only went 3/4's of the way back ten times. Tap your magazine to be sure it is properly seated. If the spring and assembly is in place and the bolt carrier will come off the rails by drawing the charging handle back, its not right. (On the left side). J.Boyette, Aug 13, 2015 #2. backwoodsshooter OEF 10-11. Immediate Action: Tap, Rack, and Reassess . I've put together a 300 blackout and it fails to lock back on an empty mag. (On the left side). If the catch does not work with an empty mag, I suspect the part of the catch that stops the bolt is broken If the bolt doesn't lock back you can see if the gun is short stroking. compare it to your BCG that works properly. Eventually, things wear out and rust. This keeps the trigger lock from hitting the bottom of the bolt carrier and preventing the upper and lower from closing all the way. This unfortunately allows the 9MM bolt to travel further down the buffer tube than necessary. If it locks back then the bolt carrier is either short stroking I.E. After firing my last round If this is the problem, the fix is fairly cheap and simple. It can cause the front of the bolt to cam down upon closing. Two Reasons a 9MM AR Bolt Catch Breaks. With an empty mag in there, it will lock back fine when I manually charge it and the bolt catch looks to be functioning normally. Failure to Extract. I can pull it back by hand but it just springs shut The rotating bolt itself features a "star" at the front, shaped like a cog, which allow the BCG to lock and unlock inside the AR-15's star chamber. within the receiver. When using and adj gas block you want to set it up so the rifle runs with This unfortunately allows the 9MM bolt to travel further The latch should be staked in place using a pointed punch or one of the staking tools available. I don't see any type of bolt latch like some of the newer guns have. Wont come back either. That would have to do with the cartridge stop. The rotating bolt itself features a "star" at the front, shaped like a cog, which allow the BCG to lock and unlock inside the AR-15's star chamber. In addition, the charging handle is used to manually cycle the bolt group. A practical but unscientific test is to press the bolt into the carrier, hold the bolt carrier group (BCG) in the air by the bolt and observe whether it slides down. I thought it was perhaps due to the ejector mis-alignment. The upper contains the bolt carrier group, and is the half of the AR-15 the barrel attaches to, so making the right selection of upper parts to match your desired performance is critical. No matter how hard I push. The bolt will not stay locked in the open position. More thought. Once the bolt is held open, drop the magazine. The chamber and bore should not be 'wet' with oil. You could try to remove the buffer tube. It is stuck! 16. I watched your video, very informative and well done. Place the selector lever on SAFE. Once the bolt is held open, drop the magazine. I believe it's called the bolt carrier group, if not please correct me. After replacing the My Colt LE6920 bolt is not locking back when the last round is fired nor when I insert an empty magpul pmag magazine. A friend of mine has a Browning A500R that seems to have an issue. I been messing around with an adjustable gas block, but the thing seems to only want to lock back after last round on the carrier. If the bolt stays back when it is cocked manualy, and you have ruled out your shells, I suspect it is your trigger group. Jul 10, 2018. As well, on the third day of running a Magpul Carbine course, I was having I was able to separate the upper from the lower. The brass was landing at about the 5 o'clock position at best. If you have the gas turned too low it will not cycle the carried back far enough to lock the bolt back. That's normal. If you do not have a empty mag, charge the weapon without a mag in the lower and hold it, then pull the check mag, try different one. The bolt carrier is sticking out of the back of the upper receiver about 1/4". When the bolt is stuck, I can jiggle the carrier back and forth with the handle maybe 1/16-1/8", but the bolt is not moving. Tank56. Unfortunatly it also prevents you from removing or inserting a mag without having the bolt back. 1. Some rifles use a plunger ejector which is spring loaded. Read Also: Addressing Common AR Malfunctions Either the extractor a hook-shaped, spring-tensioned part located on the front of the bolt at approximately the 10 oclock position as viewed from the bolt face is failing to grab the rim of the casing and pull it from the chamber, or the gas system isnt supplying the force necessary to enable the bolt to cycle. The charging handle is also used to manually lock the bolt to the rear. Here, again, the strong hand is used to pull back on the charging handle, while the support hand is positioned at the magwell of the lower receiver. Using Tom's new MAS-36 with a 22 inch barrel, we got the following chronograph numbers. MMDAVI14 Moving on to the Bren 2s lower receiver, heres where things get interesting. But, nothing. Bolt assembly will not go completely forward at all. Make sure rifle is UNLOADED. Also, check to make sure the bolt carrier key is not dented or bent. Turn the rifle in to the armorer. They do offer standard 9mm bolt carriers and barrels as well- the MK9, I believe. My 410 and 28 ga Rem 1100s locks the carrier latch to the rear when shells hit it so bolt will automatically go forward when bolt handle is released. BCG is locking back on the carrier. (This is strictly a disc brake conversation.) May 18, 2019. Only show this user. My 410 and 28 ga Rem 1100s locks the carrier latch to the rear when shells hit it so bolt will automatically go forward when bolt handle is released. I'm ignoring the percentages though because I know the Problem is that if I close the bolt, pull the trigger to uncock the hammer, put a shell in the magazine, and pull the bolt back, the shell loads onto the carrier, but the bolt stays back, instead of The AR-15 bolt carrier group, or BCG, is a critical and often misunderstood piece of the AR-15/M16 upper receiver. If everything is new I'd run up to Check Your Gas Rings. Remove the AR-15 lower. With an empty mag in there, it will lock back With the bolt in the open position, look into chamber to be sure it is clear. If the latch is not flush with the side of the receiver it can restricted movement of other parts in the receiver. It can cause the front of the bolt to cam down upon closing. Remove the AR-15 lower. The bolt failed to lock back about 65-75% of the time with the PMAGs and about 50% of the time with the USGI mags. The G3's "bolt head locking lever" is a spring-loaded claw mounted on the bolt carrier that grabs the bolt head as the bolt carrier group goes into battery. Especially many AR-10 type rifles (which is what is seen in this article) have to be run very wet. a projectile is lodged in the barrel, do not try to remove it. SamLS. Next I looked closely at the bolt and bolt carrier as they moved (or failed to!) When you are dropping the 2nd shell is it falling out the bottom?. The bolt not locking back has to do with the bolt lock. Buy Attwood 11090-3 U-Bolt Style Tire Carrier, Trailer Tongue or Frame Mount, Fits 4- or 5-Lug Hole Rims, CE Smith U-Bolt Spare Tire Carrier with Spin On Lock Brackets, 8-3/4"- Replacement Parts and Accessories for Your Ski Boat, Fishing Boat or Sailboat Trailer, 8-3/4" (back of trailer door). I called Ruger and they said they would send me a return label if I wanted to send it back. My bolt will not go back far enough to have the bolt catch engage the face of the bolt. Got home checking it out and I locked the bolt open, now it will not release! Jul 10, 2018. It rotates approximately 15 degrees to lock and unlock inside the chamber. The bolt not locking back has to do with the bolt lock. Suspect the second due to 80% lower. Locate the bolt hold open lever and examine it thoroughly. Basically it pushes the bolt back against the lugs. Can you see the bolt carrier through the mag well? I think the next thing I am going to do is replace the buffer spring and see what happens. If the bolt stays back when it is cocked manualy, and you have ruled out your shells, I suspect it is your trigger group. Test firing was with a 20 round magpul mag loaded with 5 rds. C Texan. A friend of mine has a Browning A500R that seems to have an issue. Locate the bolt hold open lever and examine it thoroughly. LvFree. If the catch does not work with an empty mag, I suspect the part of the catch that stops the bolt is broken off. A failure to extract results when the cartridge case remains in the chamber of the rifle. May 16, 2009. In addition, the charging handle is used to manually cycle the bolt group. Remove the AR-15 lower. 14 May 2012, 09:21 #9. If it is working correctly, it should move freely when manipulated and easily lock into place in order to hold the bolt in the open position. The rifle will fire and cycle with out a problem it just won't lock open on an empty mag. This is because not enough force from the shell leaving the mag tube, can trip the latch. To perform an empty reload when the bolt is locked to the rear, its best to use the bolt catch as a 4 in the How to AR-15 Series. So I have a PSA PA-10 and I can't get the BCG to lock back. SamLS. Insert a empty mag and charge the weapon, the BCG should remain back. Attwood 11090-3 U-Bolt Style Tire Carrier, Trailer Tongue or Frame Mount, Fits 4- or 5-Lug Hole Rims, Holds 8-15-Inch Tires An easy and convenient way to secure a spare tire to a trailer tongue or frameSquare bend U-bolt has threaded bracketsBrackets can be locked together (padlock not included)U-bolt is sturdy and durable zinc-plated steelTongue or frame must be between 2 Also, check to make sure the bolt carrier key is not dented or #10/11. Next I looked closely at the bolt and bolt carrier as they moved (or failed to!) When the bolt is stuck, I can jiggle the carrier back and forth with the handle Point the muzzle of the rifle in a safe direction. 2. if sure its 100% double check gas rings, make sure they aren't lined up(if new this shouldnt be much of an issue) Any way you could get a screwdiver in there and move it forward. The bolt carrier is what contacts the buffer and spring. It also absorbs a ton of force as gas expands inside the carrier. To handle this pressure and heat safely, the bolt and carrier are made from three types of forged steel: Carpenter no. 158, 8620, or 9310. Don't worry, we'll explain these three types of steel later. As I was starting to clean it for the first range trip, I found that the bolt carrier group will not lock back when I press the bolt catch levers. bolt hold-open is not able to engage the bolt. I never You may have debris that is blocking or impeding the cam pin from moving its full range. The lever makes contact in only six areas: the trigger safety block, the locking bolt, the plunger, the finger lever screw, the carrier, and the bolt. Pull the charging handle back and lock the bolt to the rear and return the charging handle to the forward position. It's fixed, steady as a stone. #1. I watched your video, very informative and well done. There may even be a live round in the chamber. The location of a spring loaded ejector can cause variability. 10/22s are not designed to lock back on the last round and Ruger never made that a feature. First, if the bolt did not lock itself back, do it manually. So I have a PSA PA-10 and I can't get the BCG to lock back. Some rifles use a plunger ejector which is spring loaded. Then separate the the upper from the lower. All the experts will point out that this is also a cause of bolt lock-back failure. I have tried multiple mags, and 2 different types of ammo. Reason One A 9MM AR Bolt is shorter than a milspec AR-15 Bolt Carrier Group. In most cases, the bolt is not correctly seated on bolt carrier. Need some advice. Basically the bolt would lock back with a shell on the carrier. The thing shoots great as a single shot, but Other than contact points, nothing should be rubbing. If I put an empty mag in it will catch on the mag like it is supposed to and lock but as soon as I hit the mag release the bolt goes forward. Other than contact points, nothing should be rubbing. The lever makes contact in only six areas: the trigger safety block, the locking bolt, the plunger, the finger lever screw, the carrier, and the bolt. bolt hold-open is not able to engage the bolt. The first attempt to remedy any stoppage of an AR-15 should be what those in the know call Immediate Action: Tap, Rack, and Reassess.. A few hundred rounds of full power 5.56 should do any braking in needed. Apr 1, 2015. The location of a spring loaded ejector can cause variability. Immediate Action: Tap, Rack, and Reassess . Casey. The first attempt to remedy any stoppage of an AR-15 should be what those in the know call Immediate Action: Tap, Rack, and Reassess.. I never new how it actually worked. The carrier latch is jammed or the carrier is not moving fully because of the shell latch not being staked in place. The location of a spring loaded ejector can cause variability. It might come back Once the bolt is held open, drop the magazine. Then, try to see if pulling the charging handle and giving the AR a slight shake dislodges the wayward cartridge. The usual result is a stoppage caused by the non-ejected case hanging up as the bolt or carrier tries to feed a fresh cartridge on its way back into battery. check mag, try different one. And its not just calipers and rotors and pads, but the nuts and bolts the hardware holding things in place. I guess the thinking here is that the bolt carrier is continually short stroking but you or me (the My Colt LE6920 bolt is not locking back when the last round is fired nor when I insert an empty magpul pmag magazine. Sadly that did not achieve a released bolt.