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1/25/2018 7:38:29 AM
Posted: 3/4/2006 10:07:15 PM EST
Not new to ARs by any means, but I have never "cross-bread" one before......

I have a BM A2 20" that I'm wanting to go to a shorter barrel and A3 upper. I have found a used but clean DPMS upper @ what I think is a "buy". I've heard that some of the early Colts have different hinge/ retaining pin sizes than newer ARs and require an offset pin to fit. I see alot of manufactures calling their equipment "milspec", but some do not. I know that companies are constantly trying to win government/ military contract bids, so I can see why they would make thier parts interchange.

In short.......will the DPMS upper fit my BM lower and most any manufacturer's barrel that I may choose without any hitches. I would like to have a "pin and run"setup.....if possible.

Any and all advice will be greatly appretiated.

Thanks in advance,
Link Posted: 3/5/2006 6:06:28 AM EST
yes, colt is the only one with the odd ball pin sizes
Link Posted: 3/5/2006 9:39:17 AM EST
So....they would fit, but will they function fine together??? MilSpec???

Link Posted: 3/5/2006 11:49:09 AM EST
they will work just fine. 100% go shoot them

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