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 Buffer Spring Cup
M31Pin, Firing Pin Cross PIN QTY 2
M31 Safety Spring
M31 Y-Series Striker
M31 SA Trigger Group Assembly - Service Work
M31 Firing Pin Bushing
M31 Spring Mount Forward Sear
M31 SEMI AUTO BOLT ASSEMBLY
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