The EZTUNE tubes sizes are one step larger than the barrel port to get the same gas drive.
The tube is 073 when measured with a pin Gage.
So the 073 tube is equivalent to an 071 barrel port, which is right on Crane spec and a good level of Gas Drive.
Let us know how it goes.
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
edited
Last edited by turnburglar; 06-07-19 at 22:23.
I’m running the voltor a5 with the standard included buffer and a green sprinco. Also ring a surefire warcomp out front. Runs and feels great.
Was wondering how long until the port in these gas tubes start to open up from use if at all?
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
according to the PSA reps they don't send 6061 tubes anymore and haven't for several years. Finish may not have the dry film lube on the inside depending on which supplier they use for that batch, but supposedly they're all 7075 (I can confirm the lack of grey dry lube on the inside not meaning 6061. Aero precision tubes don't come with it and are jet black inside. Same with Right to Bear Arms and Damage Industries 7075 tubes)
someone just asked that question about 6061 vs. 7075 yesterday on Arf and Josiah the rep confirmed that no 6061 are used anymore either
as for the A5... did you switch over to that yet? I'm interested in trying one out sometimes as I've stuck to plain jane old carbine extensions my whole life and am curious how they feel on a pistol build like that
Last edited by msedward43; 07-09-19 at 02:38.
Hey, great post! I have no way of actually testing the tube to verify that it is 7075 vs 6061, I just assumed that these budget builds had the cheap stuff. If what you say is true then I might have saved some cash, as I wouldnt need a new buffer tube or even buffer at this point.
I havent tried the A5 system yet. I am in the middle of a move and reno, but was fortunate enough to find time to install my BRT gas tube and test function. With a H2 buffer the BRT gas tube seems to have helped smoothed the gun out abit. Still not like my mid length's, (some comped) but that's to be expected. The BRT tube cycled and locked back on steel cased, my 77gr reloads and hornady frontier 556. Overall I am satisfied with the purchase, but still feel the gun would benefit from a A5 and comp if ultimate smoothness is what I am chasing. In reality I hate comps, and probably wont do the A5 anymore if my buffer tube is durable enough. I'll just shoot it till it's hot.
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