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Published on Jul 24, 2009
cncgunsparts.com web sight for this upper RR receiver M-16 7.65x25 upper that works on the same concept as the 223 uppers. A gas tube operated upper using a standard full auto carrer with a mofied bolt for the bigger round. The mags that I used are. PPH 34 round. The mag block I made in the shop, it is a top drop in the mag is set close to the front with a feed ramp built into it. The 70 round drum I made in the shop also.