This rifle length SPR PEQ II top rail 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 top rail works with both the Gen II round forearms as well as the Octagonal forearm with M-LOK.
PRI rifle length SPR top rail is a full length rail with a removable section of rail for mounting a PEQ II laser/luminator. Rail is 17 5/8" in length, with 3 crossbolts that fasten the top rail to the receiver and 2 1/4-20 flat head that secure the top rail to the forearm rail to create a ridged platform. The PEQ II rail weighs .635lbs. with a removable rail section on the front to mount a PEQ II laser. The rail is constructed of T6 6061 hard coat anodized aluminum and can be cerakote Flat Dark Earth. The rail adds .450 in elevation over the receiver.