Replacement spring for many air rifle models:
FX: Axsor, 2000, Gemini, Cutlas, Cyclone, Tarantula, Gladiator, Verminator, Monsoon, Ranchero, Rapier, Storm, Typhoon, T12, Timberwolf, Royale, Royale, Ultimate, Tornado
Logun: Gladi8or, Vermin8or, Domin8or, Solo, Gemini, Axsor, Dictator
RWS: Excalibre, Storm, Scimitar, Cutlas, Rapier
Webley: FX2000, Axsor, Spectre, Verminator

Is either used on the magazine indexer on early models (Axsor base), or is the sideplate screw on later ones.