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Complete upper receiver assembly manufactured for 45 ACP and includes one 18 round polymer magazine. Standard with A2 upper receiver, but available with an optional picatinny flat-top upper.

Upper is 100% complete with bolt carrier assembly and charging handle. Ready to drop on any standard AR15 lower receiver. Simply attach the upper and swap out to the 45 ACP magazine, and you are ready to shoot. Swap back and forth between calibers in as little as 15 seconds!

This caliber conversion does not require the changing of hammer, trigger, buffers or buffer spring. No need to add in a magazine well adapter or mag well plug either. Designed to work with any standard , unmodified AR15 lower with A2 or collapsible stocks.

Other pistol calibers available: 9mm, 10mm and 40 S&W.

TheK23PUR is a 100% complete upper (including bolt carrier assembly, and charging handle), that is head-spaced, test fired and ready to drop on your legal pistol lower, or legally registered Short Barreled Rifle.

Reliable and accurate, the K23PUR has a 6.5" 416 SS barrel with a 1x7" twist, aluminum free-float handguard (with quad-rail option), standard A-frame military front sight (with other options available), and A2 flash suppressor.

Chambered in 5.56x45 NATO, so it is capable of firing both military surplus 5.56x45 OR civilian .223 Remington ammunition.