22 June, 2011
I recently bought an XPS 2-0 because for a long time, I have been an Aimpoint fan. My dislike of EOTechs has been known for a very long time by those that know me, and all previous experiences with EOTechs has lead to failures of one sort or another. Seeing EOTechs fail while trying to zero, turning off and then not turning back on, and battery compartments failing to keep enough pressure on the batteries so the sight can work are mainly what I have seen. I have heard of other things like the sight falling off of weapons while firing are probably due to operator error IMO, but still show the problems with the sight mounting that, in my opinion, Aimpoints don’t have.
Today, I received my XPS 2-0 in the mail, and eagerly ripped open the package to see the almost pristine XPS 2-0 in the plastic case. I immediately took the thumb screw cross bolt and installed the hex key cross bolt. After co-witnessing the sight with my already zeroed irons, I turned the rifle over and dropped it on the floor, optic first. The rifle weighs about 8 pounds with the optic and mag in the weapon, and a one (1) foot drop gives the sight about a 200 G loading on it, given the carpet and floor probably flexed a little when the rifle hit it.
[edit]
a = ∆V/∆t
a = 44.2 g
∆V = 4.42 - 0
∆t = .1s
[/edit]
I immediately checked the zero on the sight to see if it shifted at all and was not surprised that when co-witnessing, the reticule MOVED. I re-zeroed it and then did the test again. But this time the reticule didn’t move, and I was wondering what I had done differently between the first and second test. I found out later that the large aperture and small aperture sight pictures look different to me. When checking the two apertures, I noticed the exact same shift between large and small in the EOTech window. This is the first time that I have seen this happen, because my previous Aimpoints bloomed a slight amount, due to my astigmatism, and caused the dot to be about 4-6 MOA except in bright sunlight. My Troy sights also stay down 99% of the time so I never noticed this before. I have dropped the rifle optic first, condition three, about two dozen times now. It has yet to lose its co-witness zero. I am going to take it to the range and get an actual zero and start bashing the optic against a 4x4 about a hundred times to see if it loses its actual zero soon.
I am going to be dropping and bashing the EOTech more as I continue to use the rifle, and will be updating this thread as I go along. I will also be getting an ADM mount for the EOTech in a few days, and the next update will include a review for the EOTech + ADM mount. For now, here are some pictures.



I would also like to add that when comparing the weight of the XPS to the T-1 that sat on my rifle before, the EOTech is significantly heavier. I am not exactly sure how much heavier, but in my caveman style of weighing each in one hand at the same time, the EOTech feels about twice as heavy vs the T-1 in a Larue mount. More to come later.


