Receiver from March 1945 production, "3 S A 3 45" marked barrel with bright chamber, "K" and punch dot marked bayonet lug on the wide base gas cylinder, "19SA/B-18" bolt, "6 SA" operating rod with relief cut, "12-SA" trigger housing with "% SA" hammer and "9SA" safety. Stock is unmarked.

Manufactured in 1943, from the first production block from Inland Mfg. Div. (between serial numbers 101 and 999,000) manufactured from May 1942 to December 1943. "3-43" dated Inland barrel, "N" marked front sight, "AI" type 3 barrel band, "S'G'" slide, "18/S" flat bolt, "ordnance bomb" trigger housing with "M/WA" magazine release and "IH" hammer, and "I.R.CO." rear sight. Fitted with a "HI" marked stock with "IO" two rivet handguard. Magazine is absent.