I have NCstar pistol scopes mounted on a 2300T, modded 2240, several Beeman P17's and a Mrodair CP-1M. I like the fixed 4x the best but they are no longer available. The 2-7x32 also works well. My friend has a few in 2.5x30 and likes them. The biggest drawback is they are all set up to be used as scout scopes and the eye relief is a bit short on a pistol but they still work. Keep in mind that the parallax/focus will probably need to be reduced for an air pistol. The NCstar models can be easily adjusted by removing the objective lock ring and turning the lens cartridge to the desired distance.
My 4x models were found at gun shows for $20. One was missing the turret caps. A call to NCStar and they sent me new ones at no charge.
2-7x32 can be found for $40.
2.5x30 are around $35
Scoff at the NCStar brand if you want, but for an air pistol, they're almost perfect. I have no experience with one subjected to recoil.
