I have been working on my friend's small rimfire rifle. It is marked "Gecado Suhl" on the barrel with the number "39" marked on the bolt and barrel. The barrel has a small chamber that will not accept a .22 caliber round. The barrel opens up widely after several inches into a diameter of approximately
.30 caliber. it is a single shot. Can anyone please advise what the caliber would be and why the barrel is sized so strangely? Thanks!Information
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