The "J.A.C.K." Uppers

The J.A.C.K. (Just Another Carbine Kit) is designed to provide a solid foundation for your next build by using high-quality, US made components. The barrel and gas system are the heart of your rifle and TNTE takes the worry out of your build by supplying you a DIY framework that can be customized to your preference. We pin the gas block, mount the barrel to the upper receiver and install the gas tube.


Just add your handguard, muzzle device, and sights. Drop in your bolt carrier group and charging handle and you're ready to go.