Crosman 13xx Pump Arm

Trying to balance utility and width, this improved furniture is designed to clear its full sweep even with one of my standard or extended suppressors attached. Well-complimented by these improved grips.

Though most factory units are attached with roll pins, this model has recesses for screws. The extended nose is meant to bracket the pivot pin and discourage its migration out of place.

1.8mm walls and 15% subcubic infill is adequate for the solid piece; 65% fill recommended for the hex pattern. The only supports needed may be a thin rib down the trough.