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10/30/2020 2:42:12 PM
Posted: 5/20/2005 9:34:44 AM EST
[Last Edit: 5/20/2005 9:36:28 AM EST by ru4freedom]
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 12:15:35 PM EST
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.
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