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 Shroud Shim
M31 Semi-Auto Assembled Receiver (FFL Required)
M31 End Cap SEMI AUTO, SPRING GUIDE SHORTENED.
M31 Suomi 36 Round Stick Magazine
M31 Buffer Spring Cup
M31 Lower Receiver Section Machined
M31 Hammer Spring
M31 Y-Series Striker
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