17th Year of Production (1972):
Coontributed by GM
Barrel Lug: Short
Battle Sight on RSL: П
Bayonet Type: Spike
Bayonet Lug: Late Non-Cutout, Screw style bayonet
Bolt Carrier: Late Non-Cutout
Gas Tube: 2 Piece
Gas Block: Cast Doesn't look machined
Receiver Cover Takedown: Regular Lever
Rear Sight Block: Cast
Serial Number Format: 1,7XX,XXX B
S/N Components: Large Font Stock, Last 5 of serial
Stock Swivel: Bottom
Trigger Group Type: Late Stamped
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bump