Or just keep your current cylinder. If you sell it you will most likely be making a loss, if you have to purchase any adapter this will make it worse.
Most importantly, two things to take into consideration :-
If you keep it you may never use it again.
If you sell it, I guarantee there will be a time that you need it and you will kick yourself for getting rid.
Cheers
Chris
BSA Ultra Multi .22 ( Falcon Merlin 10x42T, `Tweaky` reg, HW mod, Cobra Merlin+Dipol L3 ), Skan M32 .177 (3-12x44 mini SWAT), Alros Trailsman .177 (Simmons WTC 1.5-5x20 , `Tweaky` reg ), Steyr Evo 10e and a Daystate Pulsar. 177..
BSA Ultra Multi .22 ( Falcon Merlin 10x42T, `Tweaky` reg, HW mod, Cobra Merlin+Dipol L3 ), Skan M32 .177 (3-12x44 mini SWAT), Alros Trailsman .177 (Simmons WTC 1.5-5x20 , `Tweaky` reg ), Steyr Evo 10e and a Daystate Pulsar. 177..