Daniel Defense's MK18 RIII URG is a complete 5.56 NATO upper built on a 10.3-inch Government-profile barrel with a 1-in-7 twist and a carbine-length gas system. The 9.5-inch RIS III rail uses M-LOK slots for accessories, the muzzle is threaded 1/2x28, and a GRIP-N-RIP charging handle is fitted. The receiver and rail are 7075-T6 aluminum in matte black, and the whole assembly weighs 3.5 pounds.

This upper suits a Texas builder who already has a lower set up for a short barrel and wants the compact MK18 layout without assembling it from loose parts. The 1-in-7 twist stabilizes heavier 5.56 bullets, the common thread pitch takes most muzzle devices, and the RIS III rail leaves room for a light and a forward grip. Match it to your lower's buffer and check function on the range before relying on it.

Key features

• 5.56 NATO, 10.3-inch Government-profile barrel, 1-in-7 twist
• Carbine-length gas system
• 9.5-inch RIS III M-LOK rail
• 1/2x28 threaded muzzle
• GRIP-N-RIP charging handle, 7075-T6 aluminum, 3.5 pounds

An upper receiver is a part, so this ships to your door in Texas without a dealer transfer.