OK, Here is the trick. When you mount this leave screws snug but not tight. Rotate until your sight is perfect Horz. & Vert. I,use a EoTec 552. Don't forget the blue Locktite, You do need this. After you have the above done, then tighten all screws with Locktite, and after putting 200 + Rds. down range @ 100 Yards, I have nothing to say but good about what you are getting, & the money you save is well worth the little effort, as turning the Magnifier as you are looking at your red dot or EoTec. FireField is not strait Vert. on mine it sets at about 11:00 o clock. This is the most important thing you can do, & Don't forget about eye Relief, & don't mount it so close to your sight, that you cannot operate it. G.W.O.
Pros: You get a lot of bang for the Buck
Cons: None after 200 Rds. 5.56 x .45 F.M.J.B.T. KEEPS IT 0
This review was written in the old system and had content requirements that are different than reviews written today.