Gas Port location?

[grinch]

hey was wondering in anyone had the dim. for the gas ports from the breach face??

Wound like carbine, mid, and rifle if anyone is willing to share?

Thanks

[jmart]

Are you asking diameter or distance from the BF?

Courtesy Maryland AR15 Site:

Barrel Length (in) Barrel Diameter (in) Distance from Muzzle (in) Min Port Size (in) Max Port Size (in)
11.5 .625 3.850 .081 .089
11.5 .750 3.850 .086 .094
14.5 .625 8.375 .063 .078
14.5 .750 8.375 .070 .086
16 .625 8.375 .063 .078
16 .750 8.375 .070 .086
20 .625 6.875 .086 .093
20 .750 6.875 .093 .096
24 .825 N/A .089 .089


This does not include mid-lengths which I think place the port 2" closer to the muzle. Also, I'm not sure if the data for the 14.5" and 16" is accurate since I believe port locations from the BF are identical, with the 16.0" having an additional 1.5" of dwell. This data lists them the same distance from the muzzle which I believe is an error.