Here's the newer .83" UTG SLIM mount. In other words, it doesn't have the big knob on the side to catch on things. https://smile.amazon.com/UTG-Super-Slots-Picatinny-Riser/dp/B01CKYYH16

Not sure if it's different for other rifles, but on my AR to cowitness with mbuis pros I needed the .83" rise [like this one.](Leapers MT-RSX8S Inc, UTG Ss Picatinny Riser Mount, black https://www.amazon.com/dp/B01CKYYH16/ref=cm_sw_r_cp_apa_huTiBbKQJE2K4)

Bought the 1" first and was too high to cowitness.