Originally Posted by cjboi
would that be equivalent to an m4 or m16 inner barrel? I have prometheus spring and a systema cylinder kit in my gearbox. but i notice that the FPS is everywhere. like 340 and sometimes 300. why is it like that? does anyone know?
I am not sure, as I said measure and then buy.
as for your FPS, your hop-up could be off, your rubber could be damaged, your airseal may suck,