Seems I recall a older CCNL that had a tip in it to peen like in this picture... I believe to get index marks to line up (?)
Maybe not a CCNL, but seen it somewhere.
Or could it have been for head space ?
Or did I see the peening on the Receiver instead of the barrel ?
He!! now I don't recall what I seen....

Can someone explain it to me please?
Pic is from a recently completed ebay auction.
I need a vacation away from this Tundra they call Michigan..

Appreciate it,
Charlie-P777

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