The rhoms are PCP target pistols meant for Olympic shootists, none of the better known brands are particularly cheap. There's an smk I forget the model name but it was popular on the airgun forums for being a £200 introductory PCP pistol. The popular mod was to cut down or file down the pistol grip on it to provide better access to the loading port at the rear.

A couple of people picked them up at the club a few years ago and teamed them with a 2x PAO pistol scope.