I’ve had numerous SCAR’s and M14’s. I’d say Gabe is right on the AR10 platform. If it was me, I’d offer a 16” barrel with a regular birdcage style FH. I’d leave the BUIS and stock off as people are going to customize that anyway. I’d put a Geisselle trigger in it. I’d skip the slip ring and put an mlok compatible free float hand guard on it. The barrel would be the best one I could get.