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Posted: 3/3/2010 5:23:59 AM EDT
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I mated my new Bushmaster upper assy. to one of my finished Tactical Machine 80% lowers last night and found a slight problem. When mated together I need to compress the upper and lower together very hard to get the take down pin into place. This same lower accepts my other upper without any problems. I also tried the upper on two other lowers with the same issue.
Would it be ok to leave it like this or should I take some material off the upper to get it to seat more easily? Open to any recommendation. |
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Ya, I am running into the same (or similar) problem with a CMMG upper today. Take-down pin is a little tight, but I don't think it's a biggie.
ETA: Pulled the accuwedge, didn't make any difference. UPSIDE: This is a very tight upper/lower assembly, which some folks like...for me, a little rattle doesn't matter. |
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Quoted:
I mated my new Bushmaster upper assy. to one of my finished Tactical Machine 80% lowers last night and found a slight problem. When mated together I need to compress the upper and lower together very hard to get the take down pin into place. This same lower accepts my other upper without any problems. I also tried the upper on two other lowers with the same issue. Would it be ok to leave it like this or should I take some material off the upper to get it to seat more easily? Open to any recommendation. Sounds like your deck to pin C/L dimension is just a bit too big. Machine off a few thousandths. |
I had this problem recently with a Spike's lower and DPMS upper. Had to force pin in and require a punch to get it back out. Used a fine file and removed a very small amount from the bottom of the upper, (at corner above pin). Go slow and check your progress after only a few passes of the file. Now pin seats snugly and doesn't require a hammer to unlock.
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