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Posted: 11/19/2015 9:08:46 PM EDT
| It's a new build with a PSA upper and lower, PSA BCG and lower parts kit. Bring the bolt back and hold down the bolt release at the bottom, release chg handle fast or slow makes no difference bolt goes into battery. None of the others (and I have several) do this. This is without a mag inserted. I'm thinking it's the lock but I don't know. Any and all help is appreciated. Thank you |
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Pull all the way back on the charging handle, and see where the face of the bolt stops against the back edge of the ejection port. Hence face of the bolt should stop about 1/8" to 1/4" in front of the back edge of the ejection port window.
If the bolt is stopping too far forward (or the last 1/2" pull of the charging handle gets much harder than the middle of the pull), then suspect that the either the buffer or recoil spring is the wrong unit of the receiver extension in play, or could be that the receiver extension was not correctly milled and the void in it not deep enough instead. Hence here, tell us what type of stock and who's parts are in play. Or could be that when the bolt catch was installed, the spring channel was not cleaned up with blasting materal still in the bottom of the spring channel, and now the spring is coil binding up before the catch be fully raised instead. A quick check here, just shotgun the upper open, install a empty mag, and make sure that the empty mag follower is raising the bolt catch all the way itself instead. |
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Quoted:
It's a new build with a PSA upper and lower, PSA BCG and lower parts kit. Bring the bolt back and hold down the bolt release at the bottom, release chg handle fast or slow makes no difference bolt goes into battery. None of the others (and I have several) do this. This is without a mag inserted. I'm thinking it's the lock but I don't know. Any and all help is appreciated. Thank you thomas715, Try a magazine that's made of metal instead of plastic. I'll bet the follower of the mag isn't catching causing the bolt to ride over the follower during cycling operation. Impala |
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thomas715, Try a magazine that's made of metal instead of plastic. I'll bet the follower of the mag isn't catching causing the bolt to ride over the follower during cycling operation. Impala Quoted:
Quoted:
It's a new build with a PSA upper and lower, PSA BCG and lower parts kit. Bring the bolt back and hold down the bolt release at the bottom, release chg handle fast or slow makes no difference bolt goes into battery. None of the others (and I have several) do this. This is without a mag inserted. I'm thinking it's the lock but I don't know. Any and all help is appreciated. Thank you thomas715, Try a magazine that's made of metal instead of plastic. I'll bet the follower of the mag isn't catching causing the bolt to ride over the follower during cycling operation. Impala You misread the original post. |
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If you are pressing on the bolt catch and it is moving, there are really only a couple of possibilities. Your bolt catch was made wrong or has a broken off piece, or you are not pulling the bolt far back enough for the face of the bolt to catch on the bolt catch. In either case, you should be able to LOOK RIGHT AT THE thing and see what is going on. If the BCG will not come all the way back, you might have an obstruction in the buffer tube, or you might have a wrong buffer installed.
I have never seen it happen with an AR15. But my Ruger SR762 needed a good strong deliberate pull all the way to the rear, or it would miss the bolt face and catch on front bevel of the BCG. Sometimes it would hold, others it would slide past and slam home. |
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To add, if you want to lock the bolt back without a empty mag in the rifle to raise the mag catch, then you need to pull the bolt catch top lever outwards.
If you need to see this, shotgun the rifle open install a empty mag, and as the catch is raised via the mag follower via the mag spring, and will see the postion of the lever. Also, the think of the bolt catch as a empty mag last round fired lock the bolt back device instead. Hence the empty mag will raise the bolt catch after the last round has been fired, and it takes the empty mag in the rifle as the rifle is firing the last round out of the mag to push the catch up in the first place. |
| [size=2]Sorry about so slow to get back, problem was the butt stock, buffer and spring. Would not allow the bolt to retract far enough. It's a Ace skeleton long butt stock, took the A2 buffer out and used a carbine buffer and its fine. Thank you all for your help. Starting another on bolt not fully engaging( is that short stroke?) |
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[size=2]Sorry about so slow to get back, problem was the butt stock, buffer and spring. Would not allow the bolt to retract far enough. It's a Ace skeleton long butt stock, took the A2 buffer out and used a carbine buffer and its fine. Thank you all for your help. Starting another on bolt not fully engaging( is that short stroke?) If you mean that the spring is not able to push the bolt all the way forward, it's probably because you installed the wrong buffer. If you are using a rifle length buffer tube then you need to use a rifle length buffer and spring. I suspect that your problem is that you used an A2 length screw to attach the buttstock to the rear of the buffer tube. The Ace stock requires a shorter A1 length screw. The A2 screw is about a half inch too long and is just long enough to prevent the bolt from moving all the way to the rear. The A1 screw that you need looks like this: 
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Quoted:
[size=2]Sorry about so slow to get back, problem was the butt stock, buffer and spring. Would not allow the bolt to retract far enough. It's a Ace skeleton long butt stock, took the A2 buffer out and used a carbine buffer and its fine. Thank you all for your help. Starting another on bolt not fully engaging( is that short stroke?) Using a carbine buffer in a A1 length tube will allow the back of the carrier key to hit the top rear inside of the lower. Not a good thing. |
| I have the butt pad attached so it uses the longer socket head screw. It's the same I have on two others, and they have the long screw and the longer rifle buffer but I did not check what length spring is in them. With the longer spring and carbine length buffer it works fine, but I need to try the shorter spring with the rifle A2 buffer. |
| Ok, took the buffer and spring out of a AR that works flawlessly. It has the A2 set up, long spring and buffer and installed it in the LR-10. Would not work, so I took the ACE off and installed the PSA adjustable that came with the the lower and every thing works fine. Only this different is the length of the bolt. |
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A quick check to make sure that the buffer and spring are the correct lenght for odd ball set ups, is to pull the charging handle all the way back and make sure that the face of the bolt stops about 1/8" to 1/4" in front of the back of ejection port window edge.
If the face of the bolt does retract back past the back edge of the ejection port window, then shim the back of the extension tube void with a shim to get the face of the bolt to stop the correct distance in front of the back edge of the window (so the back of the key does not crash into the lower receviever and crack it. Hence quarters will work as a temp fix to get the needed shim height, and then you can come up with a better shim later. Regarding the buffer spring, easy way to make sure that is not too long, when pulling back on the charging handle with the shim in place, should not feel the spring coil bind up instead. As for the ace stocks with rifle receiver extension, most of the time the problem is that the longer A-2 butt stock bolt needed for the tube extender, is not replaced with a A-1 shorter butt stock bolt instead (A-1 stock does not use the 3/4" end of tube spacer). Hence with the longer bolt and the spacer not used, then the end of the bolt protrudes into the void of the tube, while caused the buffer to be limited by it, instead of the actual bottom of the tube instead. |
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