Description: Vism AR15 ¾" Riser Gen2 - Long • NEW and Improved ¾" Picatinny Rail Riser 5.2"L is Picatinny / MIL-STD 1913 profile and is lighter than the previous generation. • Works on AR15/M4 platforms as well as any other firearm platforms with a Weaver/ Picatinny/ MIL-STD 1913 rail. • This riser helps with getting low mounted optics and raising the optic up another ¾ 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 • Length: 5.2" • Weight: 4.2 oz.