QD Offset 45 Degree Angled 20mm Mount Base for Sights Weaver Picatinny Rail Scope Mount (45 Degree Offset), Black

It works for all intents and purposes however the picatinny rail on this extension does not perfectly match the pattern on my AR-15. The grooves are not quite as deep but are covered up by my red dot sight anyway. My OCD satisfied enough. Spacing of grooves is still functional. It mounts tightly and my red dot mounts tightly to it as well. I haven't shot at all yet so I have no help to offer there. It came with its own Alan wrench. I intended to co-witness my red dot sight with my 45 degree iron sights but this extension would've made the red dot too tall and blocked my 45 degree iron sights. I would need to probably get 2 more extensions and mount normal iron sights in order to do that just FYI. There might be a lower profile 45 degree mount out there, but this one wouldn't have been a problem at all if I had a different plan for it.

Works fine on my rifle, but it's a little loose on the rail, I'm not sure if it's the rail or the mount but other than that, it's good for the money.

The main problem with this is really quite simple. Order a couple more. I found out that I need several more. Things like this are always good to have on hand.

This was awesome. It was actually metal and its sturdy. I like it, fits well on my weapon.

This will not lock down on a 20mm rail. if you want this mount for a sight id recommend looking elsewhere as it moves a significant amount when tightened down all the way. seems to be a recurring issue as i saw at least one other review about it.

Mounts a green light flashlight off to the side so it doesn't wash out your sights. Works great with just open sights or a Red dot is nice too.

Ergonomics at its best. I side mounted a hand grip on the end of my AR15 with this beauty. Makes it look real gangsta!! Lol!!

coupled with troy battlesights. holds tight and has kept a zero through a few different shoots.