This item is new in the box.
AR15 ¾" Riser, raises your Weaver/ Picatinny rail platform by ¾"
• Helps with getting low profile optic mounts to a more comfortable cheek rest and shooting position
• Mounts via a Locking Quick Release mount onto your Picatinny rail of your AR-15 receiver. You can quickly attach and remove your optic from your receiver and maintain your zero
• Length: 5.3"
• Weight: 4.5 oz