The Sons of Liberty Gun Works M4-L89 Upper Receiver Group features a 14.5" 5.56 NATO barrel with pinned and welded ASR Flash Hider for a total length of 16". Built with premium components and SOLGW's signature attention to detail.SOLGW M4-L89 Complete Upper Receiver Group14.5" Liberty Fighting Barrel in 5.56 NATO13.75" L89 Handguard with 7-sided M-LOK slotsASR Flash Hider pinned & weldedForged upper receiver with matte finishDrivelock barrel nut systemIntegral QD attachment points at barrel nutAR-15 compatiblePerfect for competition shooting tactical applications or premium builds where reliability and precision matter. SOLGW's reputation for quality makes this upper an excellent choice for serious shooters.