Well, it certainly can't make the action stronger, being cut out out like that, but it doesn't affect normal function.

It does however affect the gas handling characteristics in a negative manner.

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I have a FN and a Mark X(FN clone?) Mauser. Could someone please show me, or tell me where to go to see, a picture or diagram of the C-ring of these Mausers. Also could you do the same for a standard Mauser. It is my understanding that this 'double cut' was done for ease of manufacture and doesen't affect function or strength. Is this true? thanks, capt david

Photo courtesy of Jack Belk.

I believe most people's opinion is that the full "C" ring is stronger. That said, plenty of customs have been built from the FN receiver and I haven't heard that any failed due to lack of the "C" ring.