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Posted: 2/12/2006 11:25:18 AM EDT
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A friend of mine and I built an A1 from a DPMS lower and parts, and a govt upper ,from the early to mid 70's. All went well until we took it to the range to sight it in. It is IMPOSSIBLE to push in the detent pin (?) to move the rear sight. We tried using a sight tool, bullet point and a drive pin, nothing works. What is the next step? Also, the bolt release will not keep the bolt in the locked open position. It looks like it is installed properly, but it won't hold. I also have another A1 that a friend gave me the lower receiver for it. I think that it is an early Olympia also from the mid 70's. The area that holds the roll pin for the bolt catch was drilled crooked. The aft "ear" has no metal in which to put the roll pin. Can that area be built up with aluminum and redrilled so that it is straight? Is this a big problem to do? Thanks in advance, Colt1MB |
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First off, welcome to the board, and congratulations on your first post (finally)! The rear sight adjustment issue sounds like you have one of the surplus uppers from CDNN, or one of the other companies. You may need to pull the rear site apart and give it a good cleaning. It isn't uncommon for the oils to congeal and lock small parts up. The bolt catch may be something as simple as the magazine you are using. Try using a different magazine, and cycle the weapon (obviously unloaded) to see if it catches on a known good magazine. For the out of spec lower you can have it built up, but I'm not smart enough to give you the specs on who to take it to or what to use. There are quite a few people who have used JB Weld or PC-7 as industrial epoxy putties to build the areas up and then reshape them. Someone else may have a better answer with the metal shaping/ forming. |
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Stickman: Thanks for the reply and the suggestion. The upper is "new" mid-70's military. The only marking that I can find is in the bottom part of the handle. It has a P and an M, but not together. I have NO idea what that signifies. The magazines were mainly "new" unused 20 or 30 round military, still wrapped up with preservative on them. I scrubbed them well, and they appear to work well in all other respects. I'll borrow a couple of mags to see if there is any difference. We will take the rear site apart, and clean it well and see if that works. Thanks, Colt 1MB |
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