My grandson just got around to trying out GP-20 that he got for 2024 Christmas. (No place to shoot it until last week.)


Everything seemed to work except that nothing came out of the barrel when the trigger was pulled.

On disassembly, I found two BBs jammed in the breach end of the barrel. I drove them out and measured them: .177", just as they should be. Measured the bore and found it about .174:.

Tried A US made BB and it fit just fine. I expect the gun will function just fine if we stick to US made BBs.

Anybody find this kind of mismatch?