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Palmetto State Armory Rock 5.7 mag extension. Uses factory spring and 3x12mm set screws to lock in place. Works with the factory frame. With a longer spring it could be modified for a higher capacity.
Update: Was asked to make a slightly longer extension. Can be found in the stl folder
LBRY Tags: 3d2a; psa; rock 5.7; mag extension; palmetto state armory
Update: Was asked to make a slightly longer extension. Can be found in the stl folder
LBRY Tags: 3d2a; psa; rock 5.7; mag extension; palmetto state armory