The Sons of Liberty Gun Works M4L89UPPER-16SPR-6MAX-SOLGW upper receiver is designed for shooters seeking precision and versatility. This upper features a 16-inch barrel with a mid-length gas system, constructed from high-quality 4150 CMV steel. The L89 rail offers extensive 7-sided M-LOK mounting options and integral QD sockets for maximum versatility. Built with a forged upper receiver, it includes a V2 button-rifled barrel and V2 4140 gas block. Ideal for AR-15 builds, this upper does not include a bolt carrier group or charging handle, allowing for personalized customization. SOLGW L89 SPR URG, 16" 6mm MAX, A2 Flash Hider, no BCG/CH M4L89UPPER-16SPR-6MAX