$20... shipped on your dime. This is a standard height. Made to attach to a GAS BLOCK not a quad rail or level height setup. I bought it to work with a FF quad rail and an A2 rear. Not happening.... was too tall. My loss.. your gain. Solid construction, snaps up and down well. I bought it because it does not use the HUGE knob. Uses two 7/64" allen head screws to attach. Sleek and low profile. Unknown brand. Bought at local gun shop.