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Sika2, the conversion is not difficult for a gunsmith. Make sure that your rifle is one of the more commonly produced BSAs before you have it modified. Some BSA Martinis are worth more than others. The gunsmith has to insert a chamber reamer and create a new dimentioned chamber. The rechambering can be done by hand. The extractor may have to be adjusted. The .22 MRF is slightly larger in diameter than the .22LR, both are rimfires, therefore the striking position of the firing pin has to be checked. More than likely it will be positioned OK to give reliable ignition. The bolt face does not need to be altered (It is a flat surface). Barrel manufacturers have often made barrels ment for the .22 MRF from .001 inch to .002 inch larger in diameter than those ment originally for the .22LR. If your .22LR barrel is of "tight" tolerances, the additional friction for the .22 MRF bullet might degrade its performance right back to your original .22LR. This is something that should be checked before the conversion.
.22 MRF is only slightly more powerful than the most powerfully loaded .22LR. You won't really be gaining much performace. You might be economically better off to just go find an existing .22 MRF rifle. Several versions are made by Savage and Marlin that are usually available at gun shows for less than $150. You would probably spend that much on the conversion. There are also BSA Martinis that were originally rebarreled and chambered for .22 MRF for several importers that are available. Check out "GunsAmerica" internet site.
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