FX Wildcat MK II - Help...!

If the wildcat is like the FX400 then do as follows:

1) Removed the barrel Oring with adenta pick.

2) Place a 20 cal rod, preferaby brass but an oak dowel will do, and stop in just behind the spot where the Oring should be placed.

3) Inser the Oring and carefully with a plastic dental pick move it into place. The rod acts as a stop and allows one to slowly let the Oring piop into it,s seat.

The first time I tried it it seemed alborious and nrevewracking. Once you learn how to do t you will marvel at it,s simplicity.

Cleaning rod worked for me two days ago, wont ever try any other method. Works like a champ. 

Anyone by chance know what size these would be for a wildcat mk2 in .22

Also are we just talking Buna 70 type or is there a better choice? I'd like to order some spares. Thanks

Every breech oring that I have switched over to Viton orings has not had another issue. They are 75 hardness and seem to hold up better. This is just what i have witnessed. Went thru several Buna 70s until i got the Vitons installed.