If it is a hammer gun look for definitive Nitro proof markings as well as the actual bullet diameter/length markings. A few years ago I was surprised to find out there are a few varients in size for the 9.3x72R, some of which will not chamber in older guns. Check chamber length on the shotgun barrels and look carefully for any bulge evidence on any barrels. With a purchase such as this I can understand that they may wish to defer any tire kickers but if you approach them with the proper personal protection (mask/rubber gloves) and they still will not allow you to properly examine the gun- leave and don't look back..
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