Manufactured around October 1943 - March 1944, the receiver for this carbine was manufactured by Union Switch & Signal and sent to Quality Hardware to be assembled and finished. Blade front sight marked "POQ" and two-leaf rear sight marked "S" and "GE-O", "EM-O" round bolt, unmarked pushbutton safety, "LT-Q" marked magazine catch, "Q-TX" stamped trigger housing, "Q.U." hammer, "GE-Q" sear, and "UN" slide. High wood stock with a "Q-RMC" two-rivet handguard, "QU" marked Type I barrel band and an oval sling cut, marked with a faint cartouche and "crossed cannons" on the right and "Q-RMC" in the sling cut. This is the missing manufacturer in most M1 Carbine collections.