In reply to:

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I have been told on very good authority that Merkel no longer builds any taper into their receivers...too expensive to machine and fit. This would explain why they shoot of face real early.

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luv2,
Don't really understand exactly what the "taper" is that you mention.
Taper on what part of the receiver?
Are you talking about the taper on the bolting system which is meant to provide automatic wear adjustment between bolting and barrel bites?