Mine is C-43612. Left side of bolt cover is 43612. Bolt lightening cut stamped 0-0004. Carrier cover 0-00 005 BX. Butt plate 3-00.002
Trigger electro 43612. Sight marked I. Magazine SL-4-00.000 Stock 43612. It's in excellent condition w/traces of cosmoline. Whatta mutt!!!