Things I liked:These mounts, although very pricey do exactaly what they are intended to do and do it well. Allows you to adjust for barrel droop and in my case a lot of windage & keep my scope very close to optically centered. I oredered these because I had to use so much adjustment on the scope that it was not consistent and I know that I am not that inaccurate. Groups were large & I called Pyramyd Air & talked with Tyler who told me what the problem could be. I also had to use 2 sided tape to keep the scope from walking rearward off the dovetails. When I received these mounts I turned both elevation & windage adjustments from lock to lock & returned to center. Then I adjusted these mounts to almost bullseye at 30 yards. At that point I tweaked POI with the scope adjustments. Made all the difference in the world. It may Take a little while but the results are well worth it if you have to use a lot of scope adjustment. By the way, this was on a Beeman RX2. I would definitely recommend these mounts to anyone who is experiencing the same problem & don't forget the 2 sided tape between the mounts & the scope tube. I am new to air gunning but learning a lot. Things I would have changed:I wish they would accommodate a hole for a scope stop but adjustable sights will not. Quite expensive but do the job. The scope stop by Beeman which mounts just rearward of the rear mount takes care of the rearward walking of the scope. These mounts do exactly what they were designed to do & do it well. What others should know:The more optically centered (elevation & windage adjustments at midway their adjustment range) the better. If too much adjustment is necessary then the springs in the scope will weaken and cause inconsistency in your grouping because the stability of the cross hairs will comprised.