Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Thanks. Does that application mean someone will suggest a size? I filled it out but didn’t see where there would be communication.
"A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb
The application info input is part of the ordering process.
If you select "BRT recommended size", we make the sizing determination during order fulfillment for your customized requirements.
Alternatively, you can send those same parameters to us at info@brt (spelled out) to get an answer back via email.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
For what it's worth, my Colt heavy 11.5" measured .069". A 1.75mm drill bit (.0689") fit very snug. Shouldn't matter, but mine doesn't have a FSB.
I put in a .0625 homemade port and run it with a M4SDII, A5H2 buffer, and Tubbs flat rifle (AR-10) spring.
Last edited by MQ105; 06-05-19 at 10:17.
"A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb
Correct gas port size is key to optimal functioning in an AR, in my opinion. You would need to disassemble to install a port anyway. Personally, I like to know exactly what I have...
I have a bunch of drill bits in metric, #, inch, and letter sizes that cover .050-.095" in small increments. I decided to use bits instead of pin gauges because I make my own inserts and use the bits for both measuring and drilling.
With the tube or port solutions, the exact current size doesn't matter much.
The smaller secondary port takes over and drops the flow down to what you want.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
I understand, but if the port is .069 already adding a .069 secondary port would be pointless for example. I think I need a point of reference to understand why this thing is ejecting the way it is. If I measure and find that it’s actually.076 that would play a part in my decision.
I think your tubes will be the best solution in the end.
"A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb
Anyone looking for a dedicated suppressed or 50/50 barrel should check out our 11.5" OPTIMUM CQB-S
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
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