M31 80% Receiver Tube
This tube has a smaller ID than the original M31 machine gun. It is used in the construction of a Semi Auto M31 rifle. The slots on the top and bottom must be machined by the builder per BATF specifications. Refer to PN M31S-GNPT-XX09-BKXX-RCKT for complete diagram.
M31 Hammer Spring
M31 Firing Pin
M31 Rear Sight Screw
M31 Firing Pin Bushing
M31 Y-Series Striker
M31 SEMI AUTO BOLT ASSEMBLY
M31 Buffer Spring Cup
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