The Desert Tech SRS A2 Conversion Kits can be broken down into 4 components: the barrel, bolt, bolt stop, and magazine. Most of the upgrades from the Desert Tech SRS A1 to the SRS A2 conversion kits can be found on the barrel. The SRS A2 and SRS A2 Covert barrels have increased fluting length both forward and rear for weight reduction. Desert Tech has also fluted the clamping section of the barrel for addition weight savings. SRS A2 barrels all now have a standardized thread pitch of 5/8x24 allowing for the use of the same muzzle break across multiple calibers. The muzzle break that comes standard with .338 Lapua Mag SRS A2 Conversion Kits has been redesigned to better mitigate recoil in order to compensate for the weight reduction of the SRS A2 models. Features of the SRS A2 Conversion KitsIncreased Weight Reduction Over A1Standardized 5/8x24 Barrel Thread PitchCompatible With SRS A1 & SRS A1 ChassisUltra Light Barrel Contour Option For 6.5 CreedmoorWeighs Less Than Most Carbon Fiber Wrapped Barrels Of Same Length Desert Tech SRS A2 .300 RUM 26" RH 5rd Conversion Kit SRS-CK-K26R