brass catcher

The STLs are oriented and scaled correctly. I have been using some M3 screws and 1/4 - 28 rod to assemble the catcher. The screws are for the rail mount, the rod to attach the body to the mounts. I drilled the mounts out to . 250, and hand threaded the rod into the body of the catcher. It has held up for about 1000 round now. I printed in ABS, it should work in PLA. You will need to make a bag. I'll leave creation and affixing the bag to you. If you use fabric, consider using fireproofing spray on it, just in case. I used some scrap cotton cloth and hand sewed it together to form a pouch. I then drilled four holes in the fround lip of the catcher to sew the pouch on to. You could just use binder clips or whatever is handy.