The Mk22 ASR kit comes with the following barrels (which are all available now on the Barrett website):
The MK22 barrels are heavier, fluted, and have the muzzle brake for the AML 338 suppressor.
- .338 Norma Mag, 27" Stainless Steel, with 1:9.4 twist
- .300 Norma Mag, 26" Stainless Steel, with 1:8 twist
- .308, 20" Stainless Steel, with 1:8 twist
The MK22 barrels are heavier, fluted, and have the muzzle brake for the AML 338 suppressor.