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The Safir and most American 410 shotguns are of course caliber not gauge. The 410 would equate to something in the 67 or 68 gauge. European countries run a bunch of different gauges that we don't even get to see here. Most of them are considerably smaller than our normal shtogun. Without doing the math a 410 gauge shotgun would have a bore about 1/4" in diameter, my guess, and not worth the time to figure it out.
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