While these may be a knock-off of Dueck Defense's patented 45 degree offset sights, and not of the same quality (which they aren't, and not all 45 degree sights are made by the same manufacturer), they are well worth the savings. Even if the first pair ordered turns out to be defective (i.e. can't zero or doesn't hold zero), you can purchase around a half dozen sets of these before you would pay what a single set of Dueck's would cost (currently $240 at Brownells). I've purchased 2 pairs of these, and both have functioned flawlessly on multiple caliber rifles. Just remember, these are back-up sights. They aren't precision sights by any means, but they will keep you on steel at anywhere from 10 yards out to 100 yards with no problem.

Just an FYI you can get these cheaper on ebay. I ordered mine for $28 shipped off of ebay, I'm pretty sure all these knock off 45 degree sites are the same, likely the same manufacturer makes them all. I've yet to try them but the over all quality of the ones I got are actually pretty good for what they are.

I just received these yesterday. I wouldn't pay more than the $35 I paid for these. Rear sight is adjusted all the way to the right and I still can't get it to line up perfect, its between Mid and side post on the front sight.It won't adjust any farther. I'd save the $ for a decent set. These will be going up on Craigslist when I buy a good pair. Screws are crappy flathead slotted aluminum bolts. I had to trim the front screw down as the machinist apparently didn't tap the threads into the front sights aluminum block far enough. My bolt bottomed out before fully tightening the sight. You get what you pay for.

Picked a set of these up. They may be knock offs but they will do the trick. No rough edges, adjustments are all solid and have a good positive lock on each click. No wiggle.

According to the picture, this particular deal is a counterfeit sold by Venom Tactical..