I was looking at airsoft stuff and came upon a M93R auto-9 C from Robocop and thought that it would be possible to make the compensator since its close to a M9. The full design is the whole thing and the spit A and B versions are for smaller printers to print in two pieces. The full version needs supports along with the split A version but the split B shouldn't need any. The print settings are 0.3 mm layer height, 10% infill, 2 shells and supports enabled for full and A designs. It's been tested on a KJW M9A1 tac rail version and isn't compatible with a airsoft M9 that does have a attachment rail. I'm not sure if it'll work with another brand of airsoft M9, let me know if it's compatible with different brands.