With a KP1 Centerfire Rifle, you can easily replace your barrel, stock, scope or sight. Whether you want to shoot a Centerfire, Rimfire, Muzzleloader or Shotgun, the choice is yours. Once you decide on your rifle barrel type, you can choose your caliber. The KP1 is available in an array of Green Mountain Barrels in 6 calibers: .204 Ruger,.223 Rem., .243 Win., .270 Win., .308 Win., .30-06, .300 Win. Mag. These rifle barrels are among the most accurate barrels on the market, and won't disappoint. You can also choose between a blued or stainless steel barrel finish. Our durable, attractive, composite stocks come in Next G-1 Camouflage and Black Composite. The versatile KP1 gun system from Knight Rifles gives you the options you want, plus the reliable construction you'd expect from the pioneer of the modern inline muzzleloader.