Picked these up for Project AR-(20)15, but they won't be hanging around here long term.
I know these are really popular, and they come in at a good price point. Nicely made and packaged, slim and fit nicely on the top rail. The front sight doesn't require a tool to adjust, which is awesome.
But the design has some deal-breaker flaws for me:
- Slick / difficult to open. Especially with a pair of gloves on. If I'm going to need my BUISs, things aren't going well, and there's a pretty good chance I'm probably going to be wearing some kind of light glove, too. The low profile and smooth sides means the sights aren't easy to grab onto and flip open. It was taking me several tries to flip the things open, in the warm, dry, zero stress comfort of my living room. Cold, wet, stressful environment...even more trouble.
- Don't lock open. The big deal to me is that they could get bumped, partially fold in and you not realize it, and then think the sight picture is still a good one. Then you're wondering why your shots aren't going where you intend them to go...that's bad. Less likely to happen, but completely plausible, especially with the front sight.
- Rear sight's aperture. I prefer the 'big' aperture...the MBUS Pro's uses a 'nested' small aperture, that you have to flip out of the way using a finger nail to get to the big aperture. And then the small aperture piece is exposed and looks like it's just waiting to get snapped off...not a big fan of this.