Brand new Rock River Arms RRA AR-15 Heavy Barrel for a Carbine Length Gas System. 16" and threaded.

Marked 5.56 NATO, so it will also chamber .223 Remington

1:9 twist

Includes barrel extension and pin--already installed

Same barrel as used in the Stag 3G rifle

1/8 twist

Barrel extension pre-installed and headspaced

1/2x28 threading

410 Stainless Steel

Rifle Length direct impingement gas

16" Upper Half assembly chambered in 5.56 mm (it will also chamber .223 Remington) with 1:7 twist barrel.

Perfect for customizing to your liking

LMT Part number F-5-6C7-CB-SF-X-XXX / L7UB1

DOES NOT Include the bolt carrier group, charge handle, or handguard, which are available with our LMT Upper Half

Fully compatible with any brand mil spec lower receiver, not just LMT