THE GREATEST GUIDE TO COLT 6920 UPPER FOR SALE

Be aware:  The Colt 6940 household of rifles are proprietary developed, with handful of consumer serviceable parts.  Particular equipment are necessary to take out the barrel nut and barrel.  The gas program is exclusive rather than built to be replaced with mil-spec parts. We just needed to to update Anyone to the Colt side slings. Seems like