daystate always has the oring on the probe but then decided to put it in the barrel, crickey I thought how the hell do I change that ???
seems the best idea to stick one on the probe once the barrel has been shortened, unless you want to cock the barrel up and shorten it from the wrong end lol
Air Arms FTP900 nikko diamond sportsman10 x 50 x 60
OSTLER FTP900 nikko diamond sportsman10x50x60