Leapers' scope mount base has a "recoil shock shoulder" in the front (left) that prevents it from shifting--ever! At right, the back of the scope mount base has a cut-out that accommodates the screw at the back of your rifle's original 11mm doveta
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Things I liked: Nice piece of hardware but did not work for my 1980 something model RWS DIANA 45 MODEL. Scope ran out of down adjustment before it could be zeroed. I actually turned it around backwards and it worked better that way. Now had to use quite a bit of upward adjustment but i was able to get it zeroed in.
Things I would have changed: In description, it should let RWS DIANA model 45 owners know that droop compensation may be to much depending on which model year thier gun is.
Things I liked: fixes barrel droop on Diana 34 22 cal
Things I would have changed: nothing
What others should know: Bought a new Leapers 4-12 scope that was set at factory Zero . Using a leapers mount it shot 17 inches low at 30 yards and 3 inches left. As I did not want to try to adjust that much drop on a new scope so I bought this base and a set of weaver bases . Now it shoots 3 inches high at 30 yards , 3 inches right and is in my comfort zone of scope adjustability
Things I liked: Easy to mount, good fit, solid, my RWS was a mount eater, this stopped all that, plus it helps with the barrel droop problem.
Things I would have changed: Nothing, the guy that thought this up had a really good idea.
What others should know: Don't waste your time trying to mount a scope on the existing rail get one of these and some weaver mounts and do it right, save time and money in the long run.
Will this fit a Benjamin Trail NP Nitro Piston?
No it will not
Will this fit my 1980's Beeman 250, I think it is the same as a Diana 45?
You would need to confirm that the 250 is in fact the same and that it has the elevated dovetail rail on it. If it does, you should be okay.
Will this work with an older RWS 34? My trigger has a 2 screw adjustment, which I believe is a T01.
I would go with the Hawke Adjustable Base instead for the T01 models. http://www.pyramydair.com/s/a/Hawke_Sport_Optics_1_Pc_Elevation_Adapter_3_8_to_Weaver_Rail/4163