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Posted: 3/25/2006 6:01:48 PM EDT
[#1]
Upper butt stock screw is too long.
Chances is the rifle has an A-1 butt stock on it (or a A-2 with the receiver extension spacer missing and the screw sucked into the butt plate), and using the A-2 butt stock screw (read 5/8" longer) which is protruding into the back of the receiver extension and limiting the buffer's full rearward stroke. Or if it has a carbine stock, Then the recoil spring (buffer) is an A-2 spring, and not the shorter carbine spring needed (read spring binding before full reaward buffer travel). |
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Posted: 3/28/2006 6:13:38 AM EDT
[#2]
As you can see, I'm a noob but I have been lurking for this answer for a couple of years. Everything I've found has said there is a problem with the upper but this upper works fine on another lower. Thanks for the explanation. It must be too long a screw since if I back the butt stock screw out just 1/8", the bolt will lock back and hold. Now how do I tell which butt stock is on my rifle. or where do I get a shorter butt stock screw? The receiver extension spacer is present so that isn't the issue.
Thanks for any replies. I knew it would be a simple solution, I just couldn't find it. cb |
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Posted: 3/28/2006 9:10:28 AM EDT
[#3]
If your using a receiver extension spacer, you should be using a A-2 screw.
Sounds like your butt stock screw is just too long, and just cutting it down (so it does not protude into the extension when tightened down) should solve the problem. |
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