Forend Quad Rails. Four picatinny-style rails for flashlights, lasers and/or other accessories. Designed to dissipate heat from rifle barrel. Compatible with AR-15, M16, M4 and other standard military AR carbine platforms. 2 piece free floating AR platform. Backed by a 1-Year Limited Warranty. AR Quad Rails are available in three models 12" Length, 10" Length and 6.75" Length.