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Posted: 8/12/2009 4:07:41 PM EDT
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I've had a lower I put together awhile back (DPMS lower receiver, DPMS lower receiver parts kit, CAA collapsable buttstock. Well, I grabbed an upper receiver group today and put it on the lower and the bolt wouldn't lock back. Grabbed by S&W MP15 lower and flip flopped them. The bolt from the new upper would lock back in the S&W lower but the S&W upper/bolt would not lock back in the new lower receiver.
I pulled the recoil spring and buffers out and the buffers appear to the be the same piece. However the spring in the newer lower receiiver is a good two inches longer than the spring in the S&W lower receiver. I put the S&W spring/buffer in the CAA butt stock and everything works fine. Question is, can I cut the extra two inches off the spring from the CAA butt stock and use it as long as the cut end is at the back of the stock? Oh yeah, S&W appears to have 38 coils on the spring while the CAA has 44 coils. Just pulled a spring from an A2 butt stock and it has 44 coils on it. I'm not complaining if the CAA butt stock has the wrong spring, just wondering if cutting it off will cause damage inside the butt stock in the future. A new spring is a "little" thing and I can order one later, I'd just like to shoot it this weekend. Thanks for any advice. |
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Sounds like your collapsible-stock buffer tube had a rifle-length spring in it.
I'd suggest getting a carbine-length spring; they're cheap, available, and will ensure that you're using the right parts. I have no idea if carbine springs and rifle springs are identical expect for length, but I wouldn't want to find out on my rifle. |
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Quoted:
Sounds like your collapsible-stock buffer tube had a rifle-length spring in it. I'd suggest getting a carbine-length spring; they're cheap, available, and will ensure that you're using the right parts. I have no idea if carbine springs and rifle springs are identical expect for length, but I wouldn't want to find out on my rifle. Beat me to it. They are differant. My vote is no. I can't remember why but I do know that when we tried this on motorcycle fork springs it was less than good. Something to do with compression rates vs. length. Springs are cheap. Tell CAA. They'll probably send you a mew spring. Will it work? Probably. 458 |
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