RB2 Airsporters are quite collectible/valuable, any drastic modification to it will destroy its value in my opinion. As already stated, get a Superstar if you want BSAs best underlever, trigger aside, they are very good, and accurate, mine responded well to a WW kit, the only gun I truly regret selling on.
Antone got a nicely fettled RB Airsporter ? And if so what was involved
Custom BSA S10 .22 PAX Phoenix Mk 2 .22 Custom Titan Manitou .22 (JB BP) HW77 .22 FWB Sport Mk1 .22 Sharp Ace .22 Crossman 600 .22 Berretta 92 .20 Desert Eagle .177