My Sarco was a drop in....
and I'd get another. It's good to hear that Boyd's has cleaned up their act for Dupage and CMP. Every stock I've gotten from Boyd's (M1 carbine, 1903 C stock, Marlin lever action) has been grossly oversized, required massive inletting work, and all the holes drilled in the wrong places. Call me stupid for trying three times. Beautiful wood, poor execution.
The Dupage, CMP situation sounds like buying Taiwan made shop tools. If you buy them from an importer, they're usually crap. If you buy them from an American company, they're usually good because they'll have a company rep in the Taiwan factory pounding on quality control.
If I need another stock, I'd like to try one from CMP and get their stamp. The Sarco stock was good, though. Mine dropped in, beautiful fit especially on the lug. I'm never buying directly from Boyd's again, for any rifle. You're better off buying a raw blank and starting from scratch.