Guru's is the Colt 6720 as mil-spec as the Colt 6920 in parts count?
Colts have come down in price in our neck of the the country. 6920 and 6920 $849. To $899. Side by side they look alike ,but for barrel profile. One M4 and other pencil. Both MP tested and castle nut ,bolt staked right. The 6720 does not have a F marked front site like the 6920. The 6720 came with magpul buis ,one magpul 20 rd magazine,no sling for $899. My 6920 a sling two 30rd mags . I have heard older 6920's came with a carry handle included with different L.E. markings. Site in with a Aimpoint T2 on a QD American Defender co-wittness mount was fast on a 25 meter aimpoint site in target. Retested at 50 yards was good. After Thanksgiving I will run it out to 200 yds. Has anyone noticed a group difference with the pencil barrel or tried the 62 S109 type ammo ? All I tried was the standard 55gr. FMJ ammo. Another concern is are the magpul 20 rd mags any good. I have the Brownell 20rd metal and they work very good. Are these newer Colt carbines still a solid build?