M31 Buffer Spring Cup
This is the M31 Spring Cup used in the Buffer Assembly. This part stops the bolts in the rear position on the M31 Rifle. The other two components in this assembly are the Buffer Washer and the Return Spring (Sold Separately).
M31 Semi Auto Receiver Assembly instructions and BATF Approval Letter
M31 Rear Sight Assembly
M31 Hammer Spring
M31 Receiver Center Section semi auto
M31 Semi-Auto Assembled Receiver (FFL Required)
M31 Spring Mount Forward Sear
M31 Shroud Shim
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