A good sight but needs some work.

I have used this sight for a couple of months. I found that installation required trimming the mounting screws so they didn't lever the base up at the rear.(Glock 17 MOS) Once that was done I took it to the range to sight it in. You need a sight tool and a set of suppressor height sights to make this co-witness. Design flaw 1. Access to the sight lock is only available with the rear sight removed. I sighted the gun in with the sights and once I had it dialed in I took the rear sight off and set the lock screws then re-installed the rear sight. I shot a few more shots to verify it was still on and it wasn't. I don't know if it creeped or what. I took the rear sight off re-zeroed the Viper and locked the screws again. I put it all back together and still it seemed like it had moved but not as bad. I'm going to use the sight for a couple more months then redo my review. The other design flaw is the requirement of taking the sight off to change the battery and re-zeroing it all over again. The dot is way bright very visible in bright sunlight to the point that it makes the dot large and blurry. But its easily fixed by turning down the intensity. Once the intensity is set it stays there when you power it off and on. It has an auto shut off that I have used several times because I forgot and left it on when I re-cased the gun. When I turn it off I put the cover on the sight to keep it from being scratched. Some observations on the sights. It's fine for range work and competition but this is not for defensive carry. With the fact that it requires pressing a button prior to use and the auto off feature I can't recommend this for that purpose. The difficulty in replacing batteries also makes it a bad choice. The sight glass it fantastic. Its clear and big so picking up the red dot is easy with practice. I thought I would be able to pull it up and find the red dot quick. Not so much, but it's not the sights fault. I need to build that familiarization with the sight before I did any quick gun work. Having used an EoTech on a rifle for the last 10 years i thought it would be like that but it requires a different set of skills. I will let you know how it goes.

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