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 Y-Series Striker
M31 Buffer Spring Cup
M31Trigger Only Assembly
M31 Semi-Auto Assembled Receiver (FFL Required)
M31 Firing Pin
M31 Shroud Shim
M31 End Cap SEMI AUTO, SPRING GUIDE SHORTENED.
M31 Trigger Spring
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