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 SEMI AUTO BOLT ASSEMBLY
M31 Rear Sight Screw
M31 Buffer Spring Cup
M31 Semi Auto Receiver Assembly instructions and BATF Approval Letter
M31 Receiver Center Section semi auto
M31 Semi-Auto Assembled Receiver (FFL Required)
M31Pin, Firing Pin Cross PIN QTY 2
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