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That's funny. A couple of days ago I was thinking about the catfights we see each time an AMT thread comes up. At least you didn't ask if they were "any good" so we might be safe.
Several sponsors have used handguns for sale. AMT's pop up from time to time. Each time more expensive.
The hardballers are 1911s and were not chambered in magnum calibers. Only up to 10mm. The AMT Automag IV or V (not to be confused with the classic Automags) were chambered in a variety of magnums up to 50 AE. Those are pretty rare up here. You could try a want to buy ad but best bet might be an auction site in the US assuming that is what you are after.