NcSTAR AR15 Picatinny .75in. RISER/GEN 2 - Long. 2" Length is Picatinny / MIL-STD 1913 Standard profile and is lighter than the previous generation. Specifications for NcSTAR AR15 Picatinny RISER/GEN 2: Manufacturer: NcSTAR Gun Model: AR-15 Condition: New Features of NcSTAR AR15 Picatinny RISER/GEN 2: Works on AR15/M4 platforms as well as any other firearms platforms with a Weaver/ Picatinny/ MIL-STD 1913 rail This riser helps with getting low mounted optics and raising the optic up another of an inch to a more comfortable cheek rest and shooting height The rail has a hollow channel through the length to make it lighter and for some firearms act as a see-through sight channel to use the iron sights Black Anodized Aluminum Construction Mounts with two Allen head bolts mounting tool included. Package Contents: NcSTAR AR15 Picatinny RISER/GEN 2 NcSTAR MARFV2: AR15 Picatinny .75in. RISER/GEN 2 - Long