...and by dnovo, "...what the heck is it?"

BFJ's answer:

"Thinking OUTSIDE the BOX {LOCK}"

of course.

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And for the record, I will say that without question

I LOVE the look of the scalloped back box locks.

Trevor at www.ttproctor.com told be the scalloping

is NOT just for looks, it "keys" the stock in place too.