The Sons of Liberty Gun Works M4-89 was designed to be Ultimate Fighting Rifle. It features their new M89 Drive Lock Rail, Liberty Fighting Trigger and the Vltor A5 buffer system. SOLGW has nothing to hide with their quality builds. This rifle comes with a NOX muzzle device and is pinned and welded to make it a non NFA rifle, bringing it to a 16″ OAL.

• Barrel: Sons of Liberty Gun Works 13.7” 4150CoMOV 1:7 MPI HPT Barrel (pinned to 16″)
• 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 an appropriately sized gas port
• Weight: 27 Ounces
• Barrel Finish: QPQ Corrosion Resistant Finish
• Barrel Extension: QPQ coated M4 Feed Ramp Extension
• High Pressure (proof) Tested (HPT)
• Magnetic Particle Inspected (MPI)

Lower Receiver: Sons of Liberty Gun Works Forged Lower Receiver

• Material: Made from Mil-Spec 7075-T6 aluminum forgings
• Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodize Coating, Flat Black Dye, Non-Reflective, NiAc Seal
• Contour is fully machined leaving no flash marks from the forging. All lowers are cut with M16 auto pocket.
• Safe, Fire, and Full Auto Pictograms.

Buffer System: Intermediate (A5) Buffer System designed to improve reliability while creating a smoother operating cycle.

• Receiver Extension: Intermediate Receiver Extension Tube made from 7075-T6 Aluminum
• Buffer: A5H2 Buffer
• Buffer Spring: SpringCo Green Rifle Length Spring
• Receiver end plate: QD Mil-Spec with properly staked Castle Nut
• Fire Control Group: Sons of Liberty Gun Works Liberty Fighting Trigger (LFT) with consistent 5.5lb pull.
• Safety Selector: Sons of Liberty Gun Works Selector
• Grip: B5 Systems Grip – Black
• Stock: B5 Systems Bravo Stock – Black

Upper Receiver:

• Material: Made from Mil-Spec 7075-T6 aluminum forgings.
• Exterior Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
• Interior Finish:Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
• T-Marks: Engraved T-Marks
• Gas Block: Sons of Liberty Lo-Pro Gas block made from 4140 Steel and Nitride Treated with Knurled Head Set Screws
• Gas Tube: Sons of Liberty Standard Mid Length Melonited Stainless Steel
• Rail System: Sons of Liberty Gun Works M89 Drive Lock
• Weight: 13 OZ
• Muzzle Device: SOLGW NOX 9-port (pinned and welded)
• Sights: No sights included