Does anyone Know the size of the gas port in the Sionics RGP?
Compared to a Colt 11.5 that's not a reduced gas port. However it is a decent size. I've gone down as low as 0.063 using the BRT custom tune gas port insert with 100% reliability unsupressed. I think the Colt 11.5 is 0.069. Not sure why 0.076 is common unless it has something to do with sustained select fire or rapid fire tests...
.076 is fairly common. Older Colts were at least that size and I remember some older 6933's being around .080.
If I am not mistaken, we were doing the RGP barrel before Colt made that barrel public. Our first ones were done for an LE agency that was issuing their 11.5" SBR with a suppressor.
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