Sig MPX Copperhead brace extension
thingiverse
This extends the brace on a Sig MPX Copperhead to make it more comfortable to shoot. I included 2 versions, one uses a m3x6mm thumbscrew to retain; you may need to slightly dimple the tube to make it work. The factory thumbscrew should go in the back, but it might take a slight bit of cleaning up with a drill to go in all the way. I'm currently using the version with no screw holes. It is very tight and I don't expect it to pull off, but it's possible. I have thumbscrews on order to use the other as it's more reliable.
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