DETAILED NOTES ON RUGER AR-556 MPR SEMI-AUTO RIFLE

A lot of M1 Carbines were issued with an easy L-type rear peep sight, which could alternate involving two diverse peephole heights for a hundred and fifty- and 300-garden ranges. The sight was mounted in a dovetail atop the receiver instead of adjustable. Machining parts to the tightest universal tolerance facilitates straightforward assembly and