Great sight, i should have read the details more closely - Holosun HE509T Reflex Optical Red Dot Sight

This is a great little sight and certainly an awesome upgrade for a pistol or even a carbine. It's clear, the reticle is clean and has a couple of different options in terms of design. It's a very compact sight and feels like it'll be very tough. I like the auto-off and shake-awake technology, I turned it on and then just stopped thinking about it. Perfect. I'd thought, in fact I'd have sworn, that when I looked it up it said the mounting clamp machined into the base would grab a pic rail. IT DOES NOT. Naturally, someone asked that very question in the reviews and I didn't look it up until after I'd received mine. It would have been perfect mounted directly to the rail atop my new Volquartsen pistol, allowing me to co-witness the iron sights, but no, it doesn't even remotely mount to a picatinny rail without an adapter. Fortunately I found one, and while it's now got an ugly mount that raises the sight too high for co-witness, it's still great. I'm not sure why Holosun felt the need to machine a mount into the body of their sight that's apparently completely proprietary, but it is what it is. I'd certainly recommend it if you can find a nice, low-profile mounting option for whatever you want to attach it to.