> TEOTWAWKI Blog: Magpul MBUS Pros: Nope.

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2/18/15

Magpul MBUS Pros: Nope.


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.
So, nicely made, but design shortcomings were a deal breaker for me. Lots of people love 'em, but I am not one. Luckily purchase 'em from Amazon so the return process is simple.

11 comments :

  1. I have a pair of those MBUIS. The non-locking feature is so that if you drop/bump your weapon, they will fold rather than break or lose zero. I like that. I didn't notice any issue with flipping them up with gloves. Maybe you could ruff up the sides with a dremel? I think it would take a pretty hard hit for the rear aperture to snap off, it's steel. But I almost never use them after they're zeroed in at 50 yards.

    I got these for an Adams Arms piston carbine because the front sight block gets too hot for polymer MBUS, which I would have gone with otherwise. My other AR is a Sig 516 and comes with aluminum flip up sights.

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    1. Understand that the folding in is a "feature", but there are a multitude of sights that lock open and are rugged enough to take a hit. I think even the plastic ones have a spring to pop the back open after a hit.

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  2. I can't agree with you assessment more. Anyone who even considers a polymer backup sight needs to get their head examined. I'm currently using a gas block/folding front sight from PRI and GG&G MAD flip up rear. Both locking. The front also has a Trijicon night sight post. Go to a single low light course, and when they tell you your glass is broken, you're screwed without it.

    In the future, I'm going to try a YHM flip up gas block and a MaTech rear sight.

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    Replies
    1. The Pros are at least made of steel and seem pretty tough.

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  3. I have a set of LWRCI's floating around if you'd like to try test drive them.

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  4. I have the polymer set and agree with dislike for the small aperture. I've never used the PROs but I do like the ones I have. Pop up easily enough and seem to hold their zero despite the infrequent use.

    My only gripe at the time was the supplier sent me an authentic rear sight and a knockoff front sight. What a hassle that was! They kept "indirectly" accusing me of swapping a real one for a knockoff and trying to send it back.

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  5. http://kitup.military.com/2012/07/back-up-iron-sight-drop-test.html

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  6. I'd recommend the Diamondhead BUIS setup. They are amazing. I strongly suspect that you got a knockoff, especially going through Amazon. This is a huge problem that Magpul has talked about extensively.

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  7. For the first issue - co-witness 100% of the time. They are backup sights - you may not have the time necessary to flip them up in a hurry.

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    Replies
    1. But these aren't sights you would want to run open all the time, due to issue 2. If open all the time was your intent, save some cash and get fixed sights.

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  8. You may want to try a Daniel Defense fixed sight. I had a Sampson flip up on my AR co-witnessed with an Aimpoint PRO. I was concerned about manipulating the release with gloves on if the PRO went down. After I switched to the DD it took a little range time to get comfortable but now I find it to be a very satisfactory set up.

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