I had one fitted to a Pro-target as I had loads of reg problems with it and was so impressed that Shawn did one for my EV2.
Both awesome and Shawn is very reasonable and also fast.
My EV2 shot variation is +/- 4 fps.
EV2 Mk3+Sightron SIII 10-50 x 60 LRIRMOA / Bushnell 8-32
Theoben Rapid 12 FAC
GROWING OLD IS NOT FOR SISSIES