Gamo urban fill probe

Recently broke out my urban to practice on along side my bullboss. I filled the urban and used it til it needed filled again but not the probe won’t go back in. I’m not sure what the deal is with it but short of beating it in with a hammer, which I didn’t do, I can’t get this thing to go
Hatsan is the bottom probe

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Goes in until the step then won’t move. I’ll go get some silicone grease today and get things moving
Silicone grease on rubber "O" rings will likely solve problem, as Willy and Scotty said, alignment or obstruction problem, if no difference. Small tube of silicone plumber's grease for valve stems/faucets (Danco #88693) worked for me. WM