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 FIRING PIN RETURN SPRING
M31 Firing Pin
M31 Charging Handle Return Spring
M31 End Cap SEMI AUTO, SPRING GUIDE SHORTENED.
M31 Spring Mount Forward Sear
M31 Firing Pin Retainer
M31 Y-Series Striker
M31 Trigger Bar
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