View Full Version : Bolt not locking back
Okay so on the last round of my magazine, my bolt does not lock back. This is weird because whenever I manually pull the charging handle back on an empty magazine, it locks back just fine. Could my gas block not be aligned properly? Also, i am using a standard carbine buffer and my rifle has a mid length gas system. I just recently went from a spikes T2 buffer to the carbine buffer and I notice that my rifle is cycling noticeably faster. Can the rifle be cycling too fast for the bolt to lock up on the last round? I feel like there are many possibilities to why it is doing this but I just want my rifle to work the way it should. Thank you.
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It's possible it's cycling too fast. You could try an H or H2 buffer and see what happens.
I'm guessing it ran fine with the Spikes buffer?
Tell us more about the gun. Specifics. Parts list, manufacturer, gas system, barrel length, etc.
It's possible it's cycling too fast. You could try an H or H2 buffer and see what happens.
I'm guessing it ran fine with the Spikes buffer?
Tell us more about the gun. Specifics. Parts list, manufacturer, gas system, barrel length, etc.
It is a rifle that I built. It is a spikes upper with a spikes nickel boron bolt carrier group. Daniel defense government profile mid length barrel. Spikes forged lower. Geissele SSA-E trigger. Spikes buffer tube and magpul CTR stock. (A lot of the spikes stuff was on sale when I was buying all these parts)
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Gatorshark
08-16-15, 21:32
Did it lock back ok with the spikes buffer? Why did you change?
How did it run before you swapped out the T2 buffer?
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Boba Fett v2
08-16-15, 21:49
If it ain't broke...
Well technically it was broke because my gun was not extracting rounds off the face of the bolt and the gunsmith recommended going down to a lighter buffer but actually I just had spikes send me a new bolt and that solved the problem and I just left the carbine buffer in there because I liked how fast the rifle was cycling
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Boba Fett v2
08-16-15, 21:58
Did you check your extractor spring and the extractor itself before you had Spikes send you a whole new bolt?
Yes I checked all of that and had professionals check it oit
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Boba Fett v2
08-16-15, 22:09
Like Steve said, try a heavier buffer and see if that solves your problem. If it is cycling too fast it could potentially cause the bolt to not lock back. Let's rule that out before we start looking at potential short stroking.
Sounds good I'll update after my next trip to the range. Thanks guys.
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I midlength should function with an H buffer, especially the DD. I assume that since you assembled this, did you align the gas block correctly? Especially since DD barrels are not dimpled for use with low profile gas blocks.
Well technically it was broke because my gun was not extracting rounds off the face of the bolt and the gunsmith recommended going down to a lighter buffer but actually I just had spikes send me a new bolt and that solved the problem and I just left the carbine buffer in there because I liked how fast the rifle was cycling
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Cycling really fast isn't necessarily a good thing. It can cause problems like you're experiencing, along with bolt bounce, harsher recoil, etc.
Is it possible for the rifle to cycle so fast that it doesn't even put a new round in the chamber?
Yes. If the bolt comes forward too fast, the magazine spring wont have enough time to push up the next round. This would result in the bolt closing on an empty chamber.
That's interesting because I have had that happen twice also
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What type of magazine?
PMAG GEN 3
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PMAG GEN 3
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One mag or multiple?
One mag or multiple?
Multiple
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