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.
M31Trigger Only Assembly
M31 Safety Spring
M31 Lower Receiver Section Machined
M31 Firing Pin Retainer
M31 Trigger Spring
M31 Receiver Center Section semi auto
M31 End Cap SEMI AUTO, SPRING GUIDE SHORTENED.
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