Quick view Sons of Liberty Gun Works SOLGW L89 5.56 12.5" A2 30RD BLK $1,800.00 $1,710.00 The L89 Series of M4's are built on SOLGW forged uppers and lowers, and utilize the L89 Drivelock Handguard. Built with an extended steel barrel nut, and their button rifled 4150CMV barrels, these M4's are built for demanding end users. These L89's also... Compare Add to Cart