Age old question about RFI .410

[Brian Dick]

Springfield Sporters was the original importer in the 1980's and they offered them with both unaltered chambers and reamed to 3" for standard U.S. mfg. .410 shot shells.

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[browningautorifle]

and reamed to 3" for standard U.S. mfg. .410 shot shells.

There we have it then... It would certainly be the safe way to do it.