O-rings for AirArms T200

[bandur60]

Last night we had a rash of failures of o-rings on air cylinders, like 4 out of eight guns' worth. Someone pencilled into the owners' manual, 7mm x 11mm as the replacement size. These seem to be just a tad too small in I.D. and want to pop back off the cylinder. Is there a different size (standard or metric) that should be used, I'm looking for local availability here? Also, it looks like the failed ones may have had 2 or 3 drops of some kind of glue (superglue?) holding them in the groove which is hardened and stuck to the brass of the cylinder.

Some of the rifles are the older XS40s, but they use the same air cylinder, right?

I'm picking up some of the 7x11s today for just in case, but if there's a better product i'll go for that. Or is a spot of glue the answer?

Edit to add: We've never used any lube on the o-rings when refilling the cylinders, and shouldn't, right?

[BigAl]

I do not know if that is the correct size. The Air Arms S200T is the same rifle as the CZ 200 if that helps at all, as CZ actually makes the rifle for Air Arms.

Alan