A1 Upper with 6920 barrel assembly?
Planning a project of using an A1 Upper, A2 Lower and 6920 barrel assembly. It's going to be my semi-auto version of a Colt 723, all Colt parts laying around. Regarding the 6920 barrel and it's F Marked sight tower, refresh my memory - will I have to crank the front sight post all the way down to achieve zero or is it the opposite?
Maj. USAR (Ret) 160th SOAR, 2/17 CAV
NRA Life Member
Black Mesa Ranch. Raising Fine Cattle and Horses in San Miguel County since 1879
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