Sons of Liberty Gun Works M4-L89 Barreled AR-15 Upper Receiver - 5.56 - 16" - No Muzzle Device

The Sons of Liberty Gun Works M4-L89 Barreled AR-15 Upper Receiver in 5.56 NATO pairs a 16" 4150 CMV barrel with the L89 Drivelock M-LOK rail and an R5 Bright Dip finish, built for shooters who want SOLGW's rigid rail interface on a full-length build.

Features:

• 16" barrel chambered in 5.56 NATO, 1:7 twist, mid-length gas system
• 4150 Chrome Moly Vanadium steel barrel, V2 profile, MPI and HPT tested
• QPQ corrosion-resistant barrel finish
• M4-style upper machined from 7075-T6 aluminum, Type III hardcoat anodized with R5 Bright Dip
• Engraved T-marks for accessory alignment
• 15.25" L89 Drivelock M-LOK handguard, titanium barrel nut, seven-sided M-LOK, dual steel QD sockets
• No muzzle device installed

The L89 Drivelock rail's titanium barrel nut and seven-sided M-LOK slots give you a lighter, more rigid mounting surface than a standard aluminum-nut handguard, with cooling slots under the top rail and dual QD sockets for sling attachment on either side. The 4150 CMV barrel's QPQ finish adds corrosion resistance on top of the button-rifled 1:7 twist bore, and because this 16" barrel already meets the legal minimum, there's no NFA consideration — just add your muzzle device, BCG, and charging handle.

Sons of Liberty Gun Works builds and test-fires every rifle and barreled upper in the United States, applying the same standards to individual components as they do to their complete rifles.