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I got this to use on a 400/516 Lower Build. Worked Great. Was a little worried about the right side having a pin instead of screw, but after installing it looked good and was easy to do. Keeps Sig lowers original. I also ordered the Bolt Catch and Ambi Mag Drop.
I got this to install on a Colt LE6920 OEM2 upper. I got the 13 inch and it looks Great on my Colt. Very easy to install after the Proprietary Barrel nut is installed. Seems to have a good solid fit on the Rifle. The machining on the rail is fantastic. I did not know if the Colt installed Gas Block would work with this rail but it works fine with plenty of room. I am very Pleased with this rail. I had looked at several before deciding on the Centurion. I feel like I made the right choice. Great Feeling Rail.
Great Scope for the Price. I was very impressed by the quality of this scope. I have used Eotech EXPS3 with magnifier and Trijicon ACOGs and for my older eyes this is much better. Love the Reticle on this as it is fast to pick up and get on target. Only complaint I have is Optics Planet shipped this to me with slow shipping Fed Ex Smart Post. Took about a week to receive it. All other orders I have placed with Optics Planet came very fast.
I purchased this to replace an Eotech EXPS3-4 with magnifier for a Sig 516. This is a very nice scope for the price. Works well for my old eye sight. I am Retired Army and have quite a bit of experience with the M16 platform rifle. On the 1 setting the eye relief makes it easy to find the target when using a good cheek weld to the gun. I prefer the reticle in the Vortex Strike Eagle to this dot, but the dot works pretty good also. With the lifetime warranty and Optics planet prices you can't go wrong with this scope.