The AT-X will ship with a 4 groove cut rifle barrel in 6.5 Creedmoor manufactured by AI in Portsmouth, UK.
Barrels supplied in the US are finished at WIN Tactical from contoured blanks supplied by Bartlein. We have been using Bartlein blanks for about 10 years in the U.S. and will continue to do so.
The interior diameter of the forend bridges is 1.300". The bridge will clear a 1.250" diameter barrel. As Jorge has noted, running a no taper 1.250" barrel may not be the best approach and we did not intend to design the rifle to such extremes. The channel weights, when installed, will also clear a 1.250" barrel. The AI barrel is 1.220" at the breach end and .950 at the muzzle. The weight of the finished 6.5 CM barrel at 24" is 5.8 lbs. So, it's very close to the "M24/M40" profile in finished weight.
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