This rifle length SPR top rail with PEQ 2 rail section is a full Picatinny rail that connects the receiver to the forearm. The top rail of the forearm connects to the forearms top rail. This creates a rigid platform.
This SPR top rail is a full length rail with a removable section of rail for mounting a PEQ II laser Luminator. The rail connects to the receiver with 3 crossbolts and then there are 2 flat head screws that attach the top rail to the forearm rails 2 stainless steel lugs to create a very ridgid platform. The rail is constructed of hard coated black anodized aluminum. The rail is 17 1/2 inches long and raises the receiver height up .450 inches.