The UTG Pro M4/AR15 Quad Rail with Extension features four Picatinny rails, each with 14 slots. This drop-in quad rail is built with a two-piece top-bottom design with integral spinal cords to ensure the perfect fit without the need to modify the rifle's barrel. The top rail extends to the upper receiver, forming a continuous mounting platform for easy attachment of accessories. The UTG Pro Quad Rail comes with black rubber rail guards for a comfortable, secure hold. Aircraft-grade aluminum provides strength and durability. Compatible with carbine-length model 4/15, the UTG Pro M4/AR15 Quad Rail with Extension attaches easily and provides a secure, stable accessory-mounting platform.Features:Specs:Note: