Interesting BUIS Drop Test
http://kitup.military.com/2012/07/ba...drop-test.html
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In order to test whether certain popular BUIS would still be serviceable after taking a hard hit, I {SNIP} dropped the rifle upside down from a height of 5 feet onto a concrete surface.
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The first BUIS dropped was the Diamondhead. At first, damage appeared cosmetic only; however, the apertures could no longer be rotated, windage could not be adjusted, and there was a definite cant to the BUIS. Point of impact shifted approximately 16 MOA. We contacted Diamondhead with this result. They replied that a newer version was available which was more durable. We offered to test the new model but production issues meant they could not ship one to us.
Next came the Troy sight. Cosmetic damage was apparent, but the sight could still be operated normally. Point of impact shift was approximately 3 MOA.
The last set of BUIS was the Magpul MBUS. Damage was purely cosmetic and the sight remained fully functional. Point of impact shift was less than 1 MOA. Unlike the other sighting devices, a second drop was performed. Results did not change, and the sight remained functional.
I always thought the MagPul MBUS was "to get you by" until you found something better. Now I'm rethinking that.
Interesting BUIS Drop Test
It's a weighted test. As previously mentioned, you will notice that the two other sights tested both lock into place, while the MBUS remains vertical using spring tension; naturally, the MBUS will fare better when dropped. Had they compared it to sights of a similar design (ARMS #40, KAC), the results would be comparable and not so impressive. Also, a test simulating a parts failure, such as a broken spring, would render an ARMS or MBUS useless, while a Troy or Diamondhead would still be useable.
Interesting BUIS Drop Test
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Originally Posted by
SPQR476
It's nearly impossible to break those springs. There's just not a way to stress them in any way that wouldn't completely destroy the sight. (and probably the firearm, at that point) Same with the detent springs on the Pros.
Let me preface this post: please understand that I like the MBUS sights. They are superbly priced, and I have two sets of them. According to the parameters of that test and against those two other sights, the MBUS are the clear winner. However, if the MBUS had been compared to the ARMS #40L or a KAC in that test, do you think the test results would have been weighed as favorably toward the MBUS as they are now?
Interesting BUIS Drop Test
The ARMS is surprisingly similar to the MBUS. Spring-loaded, with a spring lock to hold it closed. If it was dropped, assuming it did not break, it would spring back up like the Magpul.
Re: Interesting BUIS Drop Test
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Originally Posted by
SPQR476
Well sure, the folding nature of both will mitigate damage to some extent versus the locking sights...that's why the pros and the original MBUS operate the way they do. I know we've dropped both...but I'd have to ask one of the test engineers, as I don't recall the exact numbers on results.
Thanks for the reply. It would be cool to see those results, if possible.
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Originally Posted by
SPQR476
No, we went with dual biased detents on the Pro. In up, the detent biases in the up position. Down, it biases against the rail. Stays put, but still folds instead of bending/breaking. They are stiff. The detent bias gives you the same effect of repeatability as the constant bias. They do need to be manually flipped up, but it's pretty easy to do so, despite the small size.
I'm looking forward to seeing the Pros in person. I assume the dual detents function similarly to the KAC sights?
Sent from my NookColor using Tapatalk 2
Interesting BUIS Drop Test
For various reasons, the small aperture protrudes when stowed similar to the mbus, but a bit less. If it bothers you, you can drift out a pin and have just the large aperture. I run the small aperture folded down as a default position, and it doesn't interfere with any installation that I have.
On test results, we'll talk about our test protocols, but we don't publicize results of testing any competing products (except the USGI magazine, as it is somewhat generic) for reasons of professional courtesy and objectivity. If we say we tested some external product and it did "x", it's too easy for someone to claim bias, and just poor etiquette, so we keep those results inside our walls to help make our stuff better.
Re: Interesting BUIS Drop Test
Quote:
Originally Posted by
SPQR476
On test results, we'll talk about our test protocols, but we don't publicize results of testing any competing products (except the USGI magazine, as it is somewhat generic) for reasons of professional courtesy and objectivity. If we say we tested some external product and it did "x", it's too easy for someone to claim bias, and just poor etiquette, so we keep those results inside our walls to help make our stuff better.
Understandable.
Among your test protocols for the MBUS, did Magpul test side impact against a deployed sight? If so, how did it fare versus steel sights? I'm curious if the robustness of the MBUS is due more to the spring design or to the durability of the polymer itself.
Sent from my NookColor using Tapatalk 2