I gotcha. Another reason is mounting to the rail gas blocks becuase of heat.
I'll let them speak for if it was due to design of the polymer problems, or more just improvements and more benefits.
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Not that my friends are SME's, but the impression in the minds of a couple of them is that the polymer MBUS is for "keeping folded" and "seldom deployed." In other words, a true "backup" sight not to be trained with or used regularly.
A good analogy might be that it's the equivalent of the plastic spare tire in most vehicles nowadays.
I'm not saying I believe that's necessarily true, but that is the impression in the minds of some people.
Based on the article I referenced, I purchased my first polymer MBUS yesterday. :D
I haven't even taken it out of the package, but based on the cautionary tales of people I've spoken to, I would try to deploy it by gently releasing the lever while holding my finger on the spring tension, sort of like lowering the hammer with the receiver halves open.
Whether that's a prudent way to use the sight or just novice-level namby-pamby-ism I was hoping MagPul would chime in and address.
I kind of agree to that idea. Technically though, any Folding sight is intended designed as a Backup (BUS/BUIS). I prefer ones that I don't want to use every time (BUIS/BUS) to be small and out of the way and not interfere with other things on the rail, charging handle, etc. I like DD fixed sights and I like KAC Micros for BUIS and magpul for less expensive alternative if the size and space is availble. Now the next BUIS will be the Magpul Pros....they fit the ideas of the KAC Micros at a much lower price.
If you think the test was something to scoff at, you should probably read the whole thing, not the abridged version on kit up.
http://vuurwapenblog.com/2012/07/08/...tic-drop-test/
Quote:
One thing I did not mention in the post which was sent to KitUp (due to word count limitations) was that after dropping the MBUS twice, I picked the rifle up, held it over my head like the maul I used to split seasons' worth of firewood while growing up in Alaska, and swung it down on a concrete shooting table, with the MBUS taking all of the impact. It did not break or shift POI by anything more than 1MOA.
Also I will never buy Troy's again, not just because of this test, but because Ive actually had the locking detents fall out of the sight after ~2k rounds. Not to mention their hiring practices.
He did mush up one of the protective ears, though. Can't have that can we? :D
(I think you meant to say "if you think the test was something to scoff at...").
It's not widely disseminated on this forum, due to the mass consumption of Troy Kool-Aid among some members, but in my thread asking "What's your favorite BUIS?" there are rumblings of people dissatisfied with the fact that the Troy apertures have no positive retention in either aperture position, leaving people to constantly "police" their BUIS for proper aperture alignment. I noticed that the PRI rear sight lacks this positive retention also, and would probably suffer the same fate.Quote:
Also I will never buy Troy's again, not just because of this test, but because Ive actually had the locking detents fall out of the sight after ~2k rounds. Not to mention their hiring practices.
Either way, neither the Troy nor the PRI rear BUIS will sit on one of my rifles just because of this issue.
You can pretty much run the Gen 2 MBUS like you stole them. I am unkind to them, to be mild, and have never had a single issue. If you bought them off E-Bay or other non-firearm related outlet...your results may vary. The MBUS is WIDELY counterfeited, and most of the returns we receive are from people who unknowingly bought fakes. Buy from trusted vendors and fear not.
Run them like any other sight. They do not need to be babied. Any folding sight will, however, be stronger in the stowed position, so you just have to make a judgment of how quick you want to be able to transition vs how cautious you want to be against accidentally throwing your rifle off a cliff. :-)
If I am running an EoTech, my front is always up, and my rear is usually down. With an aimpoint, ACOG, or a low-powered variable, I generally leave both down, maybe have front up with Aimpoint for close stuff. Doesn't matter to me what they're made of. YMMV.
Although not "in style" now, the ARMS sights are pretty rugged, I've seen them on guns that take constant beatings and they are still working.
Good to know. I just installed a polymer MBUS on my shooter, so that tells you I have quite a bit of confidence in it now. I would never knowingly install something I had significant doubts about.
I plan to leave mine stowed. My whole reason for wanting a folding BUIS in the first place is because I decided a fixed sight was too cluttered in low light.