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Bbl twist AI AT

The UK proofed Barrels are 1:12 and will stabilize the 175 no problem. I shoot 178 Amaxs out of my 20” Uk barrel at about 2535 fps. Zero issues.
Some will tell you scrap the factory barrel because it’s not Bartline or 1:10 or whatever else but I’d shoot it first before thinking you need to replace it. My factory 308 barrel is a lazer.