AR-15 Gas Port Sizes

Disclaimer: These are lists of compiled information from multiple sources. While we make our best effort to test and produce these should be considered for reference only. Any time you start messing with the gas port on your rifle you run the risk of destroying the barrel or causing it to be over gassed. It is much better to slowly work your way up to what you would be happy with.

AR-15 Platform 5.56mm
20"	rifle	5.56	0.0935
20"	rifle	5.56	0.096
20"	rifle	5.56	0.098
16"	mid	5.56	0.078
16"	mid	5.56	0.081
16"	car	5.56	0.0625
16"	car	5.56	0.065
16"	car	5.56	0.07
14.5"	car	5.56	0.067
14.5"	car	5.56	0.086
11.5"	car	5.56	0.081
11.5"	car	5.56	0.089
24"	rifle	5.56	0.089

AR-15 Platform 7.62x39mm Conversion
20"	rifle	7.62x39	0.12
20"	rifle	7.62x39	0.125
16"	car	7.62x39	0.078
16"	car	7.62x39	0.081
16"	car	7.62x39	0.0938

DPMS LR-308 Style Rifle
18"	rifle	0.308	0.0960
18"	car	0.308	0.0635
16"	mid	0.308	0.078
16"	mid	0.308	0.081
16"	car	0.308	0.07
16"	car	0.308	0.073
16"	car	0.308	0.076
20"	rifle	0.308	0.0935
20"	rifle	0.308	0.096

AR-15 Platform 300 BLK Conversion Subsonic Ammo
16"	car	300 BLK	UNSUPRESSED	0.12
16"	car	300 BLK	UNSUPRESSED	0.125
16"	car	300 BLK	SUPRESSED	0.106
16"	car	300 BLK	SUPRESSED	0.11
16"	pistol	300 BLK	UNSUPRESSED	0.067
16"	pistol	300 BLK	SUPPRESSED	0.086
9.5"	pistol	300 BLK	UNSUPRESSED	0.093
9.5"	pistol	300 BLK	SUPPRESSED	0.093
8.1"	pistol	300 BLK	UNSUPRESSED	0.104
8.1"	pistol	300 BLK	UNSUPRESSED	0.12
8.1"	pistol	300 BLK	SUPRESSED	0.086
8.1"	pistol	300 BLK	SUPRESSED	0.093
AR-15 Platform 300 BLK Conversion Supersonic Ammo
16"	pistol	300 BLK	UNSUPRESSED	0.0625
16"	pistol	300 BLK	SUPPRESSED	0.059
16"	car	300 BLK	UNSUPRESSED	0.099
16"	car	300 BLK	SUPPRESSED	0.093
9.5"	pistol	300 BLK	UNSUPRESSED	0.073
9.5"	pistol	300 BLK	SUPPRESSED	0.067
8.1"	pistol	300 BLK	UNSUPRESSED	0.076
8.1"	pistol	300 BLK	SUPPRESSED	0.067

The 300 Blackout data has been compiled from Micro MOA