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Posted: 10/24/2003 3:04:18 PM EDT
I just ordered an RRA 20" Stainless barreled upper from ADCO, and am having it contoured to gov't specs and chopped to 18". I plan to drop this on my mid 1980's vintage Colt lower.

I have heard about Colt using larger pins than other mfgs. Which pins are larger, and who sells an adaptor-type device?
Link Posted: 10/24/2003 3:46:34 PM EDT
I-O, If you front pin is visually larger looking then your rear pin, you have a large hole receiver/upper. If both the front nad back pins are the same size, you should be OK, as far as I know. Bushmaster sells an adaptor. Jim
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