BSA Ultra MMC, Ultra & Scorpion T10, Goldstar etc. Air Rifle External Regulator.
Goldstar, Cadet, Lonestar, Techstar, Sportsman HVn etc. Precision BSA Airguns. The Regulator will only keep an airguns power FT LBS / Joules to the power at which it has already been - tuned to - at a - set working pressure.