Sons of Liberty Gun Works M4 Patrol SL 5.56 AR-15 Upper - 16"

The Patrol SL Upper Receiver Group is their entry level carbine build. It is built with Hidden high quality components. At Sons of Liberty Gun Works they always tell our customers, it's not what a rifle company tells you, it's what they don't tell you. Below you will find the complete specifications on the Patrol Upper. They have built our guns to run through years of hard use, and they have nothing to hide. Specifications: Barrel: Sons of Liberty Gun Works 16" 4150CoMOV 1:7 MPI HPT Barrel Caliber: 5.56 NATO Chamber Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E) Twist Rate: 1/7 Twist Six Groove Thread Pitch: 1/2-28 Threaded Muzzle Gas Block: .750 Gas Block Journal with appropriately sized gas port Weight: 29 Ounces Barrel Finish: QPQ Corrosion Resistant Finish Barrel Extension: QPQ coated M4 Feed Ramp Extension High Pressure (proof) Tested (HPT) Magnetic Particle Inspected (MPI) With "F" marked Front Sight Block Upper Receiver: Material: Made from Mil-Spec 7075-T6 al