Titan Air Rifle Main Springs
Please see below which spring is compatible with which air rifle.

R02/1: BSA Airsporter, Mercury, Challenger, 635 Magnum, Supersporter, Supersat, Goldstar, Centenary, Air Arms Firepower, Jackal, Woodsman, ProSport, Original Mod.34/35/36/38/45(48/52 std power), RWS Firebird, Falke Mod 80-90, HW77 (std power), HW99

R02/2: Hw80, Webley Eclipse (FAC), HW90 (to replace gas ram)

R02/3: HW77 (FAC), HW97, Orig.Mod 35/45/50, Hammerli 40 l

R02/4: HW35, Webley Eclipse (STD), Orig Mod. 48/52 (FAC)

R02/5: BSA Meteor MKI-5, B4(U/L), Cometa 200 & 300S, Diana Mod. 24/26/27/28/G46/70/71/78/79/80, Vostock

R02/6: BSA Meteor MK6, Cometa 100/200/400/Fenix, Gamo CF30

R02/7: Webley Tracker / Osprey / Excel / Viscount / Xocet / Stingray / Falcon / Hawk MK1-3, Norica, Relum (using existing inner), Baikal, Westlake, Cometa 5, Haenal Mod. 303, Gamo Sniper / Commando / Delta / Apache / CF16 / Rangemaster / Statical / Magnum, Gunmark Phantom, NAC, HW30, HW55 & 55T

R02/8: Webley Vulcan / Omega / Longbow / Tomahawk, HW95, HW98, Gamo 3000

R02/9: Air Arms TX200 Mk1 & Mk2, Hw57