M31 Semi Auto Receiver Assembly instructions and BATF Approval Letter
This packet includes the steps necessary to build your own M31 semi auto receiver. The BATF letter included lays out the rules for manufacturing and proper marking. Please look at PN M31S-GNPT-XX09-BKXX-RCKT for a complete diagram.
*This Package is for the receiver only, not the complete rifle.
M31 Spring Mount Forward Sear
M31 Shroud Shim
MG34 FA Bolt Assembly
M31 End Cap SEMI AUTO, SPRING GUIDE SHORTENED.
M31 Rear Sight Screw
Gas Piston System Kit for AR standard carbine length
M31 Charging Handle Return Spring
MG34 Rear Sight Latch - Left and Right
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