The Primal is a .45 caliber rifle-centric yet multi-purpose silencer. Although it is optimized for rifle calibers like .458 Socom, 45-70, 450 Bushmaster, etc. it can accept the SD500 booster assembly making it usable as a handgun silencer, making it the most versatile model in the line-up. It can use direct thread, KeyMod, Xeno, 3-lug, or SD500 (Nielson Device) and it can eat anything from high pressure magnum calibers like .338 Lapua, all the way down to your light duty pistol calibers. So, whether you are looking for a great solution for your.458 or 45-750, or just needing a do-all option while you start filling your toolbox with more dedicated models, the Primal has you covered.