The Ultradyne Apollo provides breakthrough recoil reduction for those who want the best performance available. Utilizing advanced imaging and precision instrumentation, Ultradyne engineers have created a compensator with ultimate recoil reduction. Muzzle rise has been optimized as well, without venting gas into the sight-path or back towards the shooter. Note: Rated for the standard cartridges in the following calibers: 223 Rem, 5.56 x 45 NATO, 224 Valkyrie, 224 Weatherby Mag, 22-250 Rem, 222 Rem Mag, 222 Rem, 22 Nosler, 220 Swift, 22 PPC, 22 BR, 22 Hornet, 204 Ruger, 218 Bee FeaturesUltimate Recoil ReductionMinimal Muzzle RiseClass-Leading Performance416 Stainless Steel, Ultra Rugged SB Nitride