2 versions of brass catchers 1: 1/4-20 nut 1: 1/4-20 x 1.25 knob or bolt When loaded you will have to scale it up by 2540 to convert it to metric measurements
brass catcher 3D Models to Print - yeggi - page 6
Ivan's 3D Printable AR-15 Brass Catcher - DEFCAD
ar15 bolt tool 3D Models to Print - yeggi
STL file AR15 Brass Catcher 🔫・3D printing design to download・Cults
STL file KWA MP9 M4 Handguard adapter 🔫・3D printable model to download・ Cults
AR-15 Brass Catcher by wormskill - Thingiverse
AR-15 Brass Catcher by wormskill - Thingiverse
ar15 bolt tool 3D Models to Print - yeggi
ar15 upper 3D Models to Print - yeggi