Hmmm.. I don't know. I've been collecting and looking at the Military Remington 513T's for a long time and I have never seen this variety of cartouches on a single stock.
eBAY: REMINGTON 513 T Training Rifle STOCK Cartouches & Proof Marks no metal USGI
REMINGTON 513 T Training Rifle STOCK Cartouches Proof Marks no metal USGI | eBay