Picatinny Riser Mount, 3 Pack Low High Profile 1 Inch 0.83 Inch 0.5 Inch Rail Riser Mounts Adaptor with 3 Slots Picatinny Rails for Scope Rings Optics Sights

The overall quality is good, I particularly like the larger than usual Allen bolts to secure them to the master rail. There is one minor problem: the middle size (.83in) has a cross section slightly narrower at the obtuse angle underneath the knuckle, to the point that one of my optics cannot be tightened fully on that one. This is the only issue with the set, and it very likely has to do with that optic and its built-in claw system rather than this merchandise. I am, in any case, using only the highest and lowest risers, so not worth a return; if necessary, a shim could be used.

Perfect for what I was looking for. I’m not sure why but one of my red dots won’t tighten down. It may just not be made for that specific one. But the other one I have fit great and the height was just what I was looking for. Only thing I’d say negatively would be the heights of the 2 smaller ones. Would like for the 2nd to be a little taller. But that’s just my preference and nothing to do with the good quality of the product.

for my cz-457 I wanted to be able to use the iron sights with a scope with cz bolt-action u need all almost in'' high clearance for the ejecting case, using 2 rails gives you that clearance.

Do not exceed 20 in/lbs or you'll strip it out. These will work for my range toy but I would not recommend for any serious application.

Easy to use. Needed thread lock but it's good

My optic either hung over the front or the back. I guess it would work but it just looked too tacky for my taste.

I bought this kit to mount my TRS 25 on a 300 Blackout rifle using the .83" riser. Fit was excellent, finish looks very good, lightweight and rigid. Held zero after 100+ rounds. Very satisfied with this purchase!

These are not good! I am unable to to torque the screws to where they will not come loose due to the vibration because they strip long before that. The metal is way too soft for this application. Save your money-6/3/2021 Revision- seller reached out unsolicited to offer a replacement which arrived the day after they contacted me. The replacement seemed to be better, I was able to torque the screws down without stripping this time. Maybe I just got a defective part the first time.