Doesn't change it in the slightest. There is an AR-15 style detent pin at the rear of the assembly that pushes out, and allows a piece to be moved rearward, releasing the rail from the Dollhead, and the whole rail swivels up out of the way. It also maintains zero beautifully, especially mounted on a well built AK like the SGL. One complaint I have, being a shooter with glasses, is with the standard Warsaw length stocks, from the prone position the rear sight tended to tap my glasses just a bit under recoil. I planned on switching out stocks anyways, so it doesn't bother me, but for some it might be a pain. I actually completed the install with no workbench, no vise, and minimal handtools. All one needs to install it is some mechanical knowledge and common sense.