it is a raider 10 or so the plague on the side says, i thought it might have been modded to .177 if it was originally a .22 would this affect the power?? maybe I should get it chrono'd, don't think it is underpowered shot a rabbit head shot 40yds last night, maybe it is over powered. would be nice to have a gauge, could this be retro fitted do you think?? if so who would do it?

Thanks

paddy