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. Note6.5mm Rated for the standard cartridges in the following calibers: 6.5 Creedmoor, 6.5 Grendel, 6mm Remington, 6mm Rem, 6mm BR, 25-06 Rem, 257 Roberts, 243 WSSM30m Caliber rated for the standard cartridges in the following calibers: 308 Win, 7.62A-51 NATO, 300 AAC Black Out, 300 Savage, 303 Savage, 30-30 WinNot recommended for barrels under 16" FeaturesUltimate Recoil ReductionMinimal Muzzle RiseClass-Leading Performance416 Stainless Steel, Ultra Rugged SB Nitride