Quote:

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Doubling is common by most boxlock double rifle's, not only by Merkel, and the problem are the sears or the trigger's! The gunmaker's have alway's a explication, but our problem is the very hard recoil by the big bore double's!

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No, No, No, No. This is not correct.

Most Boxlocks do not Double. It is a rare occurance for a good boxlock to double for any reason other than shooter error.