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Page AR-15 » Rifles, Uppers, Lowers, Barrels, and more
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Archived [ARCHIVED THREAD] - Putting an RRA upper on Colt lower - Pin size
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
[#1]
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

Archived [ARCHIVED THREAD] - Putting an RRA upper on Colt lower - Pin size
Page AR-15 » Rifles, Uppers, Lowers, Barrels, and more
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