Had a question about the inner barrel/hop up. I`ve converted the front end of my kwa 2gx m4 to a shorter setup. This required me to change my inner barrel to a Prometheus 300mm 6.03 tbb. There was a metal ring that went around my old inner barre and into the hop up. This ring does not fit around the Prometheus barrel . I was wondering what this ring is and if there are other sizes? Any help is appreciated.
Edited by t0futurkeyyyy, 29 May 2013 - 11:27 PM.