GEN2 AR15 3/4" Riser, raises your Picatinny rail platform by 3/4". Helps with getting low profile optic mounts to a more comfortable cheek rest height and shooting position.GEN2 model has a new updated shape, next generation Locking Quick Release mount with shorter lever, and is lighter than the previous version. Mounts via a Locking Quick Release mount onto your Picatinny rail of your AR15/M4 receiver. You can quickly attach and remove your optic from your receiver and maintain your zero. There is a see through channel below the rail to keep the mount lighter and for some firearm types, it may allow you to use some factory iron sights.