APS Cam870 "Snap cap"

thingiverse

A dummy shell for dry firing. If you want it to cycle in the receiver you'll have to file the 45 degree angle on the flange flat. I'm not entirely sure if this works as intended, It could just be wishful thinking. you might need to double/triple the spring tension, but its probably better then nothing. Spring size is 6.5mm OD x 17.5mm length. Please post makes, it makes me feel warm and fuzzy <3