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Archived [ARCHIVED THREAD] - M4 Upper?
Posted: 5/20/2005 10:34:44 AM EDT
Can I mount a  military contract 16" M4 upper on my Colt MT6731?

Will the Bolt, Carrier, & charging handle from the MT6731 fit & funtion properly in the M4 upper without changing the headspacing or anything??

I have the MT6731 upper set up for varminting (Scoped w/no iron sights front or rear) & would like to be able to put a "Entry" style upper on it useing the same Bolt, Carrier & Charging Handle if possible!!!

Link Posted: 5/20/2005 1:15:35 PM EDT
[#1]
Yeah, any standard upper will work on your lower, as I'm pretty sure your lower has a small pivot pin. I'd recomend a separate bolt for each upper, as they tend to mate with the barrel extension's lugs over time. You can safely swap the charging handle and bolt carrier between uppers though.
Archived [ARCHIVED THREAD] - M4 Upper?
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