Sons of Liberty Gun Works (SOLGW) is a San Antonio, Texas manufacturer of AR-15 rifles, pistols, and components. The M4-EXO2 and Patrol Rifle series are assembled from 4150 CMV steel barrels, 7075-T6 aluminum receivers, and nitride-coated bolt carrier groups. SOLGW backs its firearms with a Lifetime Warranty. The company also sells individual lower receivers, handguards, and mil-spec trigger groups for builders, and places emphasis on customer education alongside product sales.