Is the gas port the same size on the Colt fbi heavy barrel as the standard Colt 11.5 inch barrel?
Is the gas port the same size on the Colt fbi heavy barrel as the standard Colt 11.5 inch barrel?
Grant measured one to be .069.
https://www.m4carbine.net/showthread...20#post2328220
Post 150
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That is a good size.
I believe the 6933s are ported quite a bit larger.
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BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
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BRT Covert Comps 5.56, 6X, 7.62
I prefer these 11.5s to be this, and even less. I cant see why anyone makes an 11.5 with a larger port. Even companies that offer (reduced) port sizes aren't even this small. Guess you need to cater to folks running garbage ammo these days.
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I have been considering one of these barrels but am yet to get a confirmation of port size. If 0.070 is acceptable for 10.5, I would expect an 11.5 to be smaller.
I just bought one and wanted to see if I was going to have to change my setup. My current colt upper has the standard 11.5 barrel on it and on full auto with a suppressor you get a face full of gas. I run a xtra heavy buffer to keep the rate of fire down.
The last 6933 I measured (newer production) came in much smaller than .082. IIRC it was in the low .070's.
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I have a 6933 in quarantine and while I've only been able to put a few rounds through it, it gave no signs of being over gassed
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