Cờ buồng đạn 9mm và .45 cal (chamber flags)

I printed in PETG at 100 fill% in orange. These have enough lip, like a shell, that if the slide is racked quickly, ejects like a shell, letting a round from the magazine load. So far the lips have held up, but I expect them to fail eventually. The small flag allows the weapon to be holstered with the flag in place, useful for storage. If printed at lower density infill, they break at the shoulder past the lip from extractor spring forces.

In this set is a short flag 9mm and a longer flag 9mm and .45 cal with a loop. These work well in my use cases, YMMV. FreeCad files included. Print a lot and give the away at the range. Be safe out there.