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I don't know about that little Cricket, but most barrels for .22 LR are made of fairly soft steel, while those made for .22 WMR are hardened to stand up to the greater heat, higher velocity, and the jacketed bullet. A .22 LR barrel won't last long firing .22 WMR. That is the main reason why WMR guns cost more than the apparently same gun in .22 LR. And why rechambering a .22 LR to .22 WMR is not advisable.
Jim
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