Ok.. Ive been told, and seen many flatlines that the dropzone will not work on around the reg.. but there is a few that do work and I want to know if there is any different style flatline regs that vary in size...

https://www.automags.org/forums/showt...threadid=18596

there is a pic in there, and id appreciate if someone could tell me if there is different diameter flatline regs floating around.