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?