DD 11.5" or a Sionics 11.5" barrel?

[natehansen66]

My 11.5 Sionics rgp cycles Wolf steel case at near 0deg with A5H2 no problem.

My Sionics 11.5” RGP runs everything I’ve tried 100% unsuppressed, including PMC Bronze. The general consensus seems to be that it’s gassed perfectly for unsuppressed use. I still need to test mine in extreme cold with weaker ammo.

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[prepare]

Does anyone Know the size of the gas port in the Sionics RGP?

[Captains1911]

Does anyone Know the size of the gas port in the Sionics RGP?

Others have reported measuring it around 0.070”, I believe.

[prepare]

Others have reported measuring it around 0.070”, I believe.

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...

[Iraqgunz]

.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.

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...

[ajyaros]

Sionics.


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