Is there thread that addresses gas port size by manufacturer, carbine and rifle length barrels.
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Is there thread that addresses gas port size by manufacturer, carbine and rifle length barrels.
No. There really is only two set standards (that very few follow). The 14.5" M4 and the 20" A2/A4.
All middy's, 10.5/11.5/12.5/18" all have a GP size that the manufacturer believes works the best. Some have a good GP size, but most are WAAAAY over gassed.
Typically all your none mil-spec guns are going to be over gassed (BM/RRA/Oly/DPMS/Stag/SW/etc).
C4
If you took one of these over-gassed rifles and shot them on a FA lower with weakish ammo - say commercial .223 ammo - what cyclic rate in FA would you get?
And if that is not known, what cyclic rate would you set them at, with typical commercial .223 ammo, if you were picking the gas port?
Last edited by rsilvers; 09-28-10 at 12:53.
I mean what do you think such an over gassed upper, as you have run across, would run in FA -
600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050 RPM?
Cause that is a good way to know if something is over-gassed. I am not sure how else to tell besides high speed video.
Yes. The optimal choice would be a Switch block from Noveske (if you wanted a gun for suppressed use and one without.
Both BCM and DD typically use GP's on the smaller size. So those are also a good option I think.
For me, SBR's are so obnoxious that I ONLY shoot them suppressed. So having a gun setup for suppressed 365, is the best option (YMMV).
C4
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