M3/M3A1s were issued to tank crews in the 60's and perhaps later and I trained with them in 1968 at the Fort Knox Armor school. There were specific weapon designed racks on the inside of the turret of the M-48 Tank to mount these. The rear sight was just a bent tab with a hole in it, spot welded to the receiver. Even with this crude, non-adjustable peep sight I remember them being reasonably accurate. TomInformation
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