Posted: 2/11/2012 5:16:41 PM EDT
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I picked up my very first AR 15 on monday, a Larue 16" OBR. I took it out to the range today for a test spin with a friend. For some reason the bolt is not locking back at the end of the mag. I was using 30 round PMags, and have 7 total, the problem was persistent with all seven new mags. I was shooting Federal Lake City 5.56 XM855 62gr, and went through around 250 rounds. I was hoping the guys from the forums might know something to help.
Thank you in advance. |
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Quoted:
I picked up my very first AR 15 on monday, a Larue 16" OBR. I took it out to the range today for a test spin with a friend. For some reason the bolt is not locking back at the end of the mag. I was using 30 round PMags, and have 7 total, the problem was persistent with all seven new mags. I was shooting Federal Lake City 5.56 XM855 62gr, and went through around 250 rounds. I was hoping the guys from the forums might know something to help. Thank you in advance. Just send it to me. I'll get it fixed after I put a few thousand rounds through it. Seriously, try another magazine. Try a Standard GI mag and see what happens. |
| New to AR's myself so I can't speak from personal experience, but a friend of mine with a diff manufacture gun was having the same problem. He said he switched to a heavy buffer and problem solved. Not sure if it will take care of yours but just figured I would pass it along. |
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Never heard of this issue in a consistent manner like this.
Best advice is to call the shop...They will take care of you and get to the bottom of it. Does it work when you cycle it manually on an empty mag? Recommend trying a standard USGI mag as that will at least eliminate one possibility. You may also try "exercising" the Buffer spring as it may be a little tense being brand new...(only in natural spring motions––-don't bend anything) Regardless, Mark will make it right. |
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I went through this with my POF. My pmag follower wasn't engaging the bolt catch because the... "u shaped groove" at the back of the magazine was up too high.
Local gunsmith showed me by just inserting empty magazine into lower. You could watch it happen. I dremelled that "u groove" maybe 1/16" deepee- problem disappeared. Good luck. |
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Thank you all for the responses,
When I cycle it by hand with a empty mag it catches just fine, with all of the pmags i have. And i have the gas block is pointed o the left side of the barrel when shooting, I believe that is the correct position from my understanding of the owners manual. |
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Quoted:
Thank you all for the responses, When I cycle it by hand with a empty mag it catches just fine, with all of the pmags i have. And i have the gas block is pointed o the left side of the barrel when shooting, I believe that is the correct position from my understanding of the owners manual. I may be wrong but my selector is shifted right when shooting unsurpressed. ETA: this just in...I may also be an idiot...is she lubed up properly?...like dripping? |
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Quoted:
Did you switch the gas setting to see if that was the issue? This was my first thought. Unsuppressed my rifle will not lock back on empty if I forget to switch the PST back to unsuppressed. Of course, I never shoot unsuppressed other than to prove my point why I don't shoot unsuppressed. |
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Quoted: Quoted: Did you switch the gas setting to see if that was the issue? This was my first thought. Unsuppressed my rifle will not lock back on empty if I forget to switch the PST back to unsuppressed. Of course, I never shoot unsuppressed other than to prove my point why I don't shoot unsuppressed. This was my thought too. Open your instruction booklet and verify you have the port selector on the normal and not suppressed position. |
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It's very common to have new guns not lock back (short stroke) for the first 10 to 200 rounds. It's just a fact. However, it happens usually with 223 and not 5.56. Still if your rings, bolt, bolt carrier is just real tight, and your recoil spring is extra tight for some reasons, this can all stack up against you until it all seats in.
Edit to say most all new guns, not necessarily LaRue Guns... |