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 Charging Block
M31 Lower Receiver Section Machined
M31 Rear Sight Screw
M31 Spring Mount Forward Sear
M31 Semi Auto Home Built Receiver Kit
M31 Shroud Shim
M31 Safety Spring
M31 Semi Auto Receiver Assembly instructions and BATF Approval Letter
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