Posted per request from a forum member, from M14 Rifle History and Development Fifth Edition:

GU-0560 Federal Ordnance M14 receiver
GU-0706 M14 with Viet Nam camouflage fiberglass stock
GU-0707 M14 with woodland camouflage fiberglass stock
GU-0708 M14 with desert camouflage fiberglass stock
GU-0709 M14 with USGI walnut stock with selector cutout filled in
GU-0710 M14 parts kit with minor, Federal Ordnance receiver and fiberglass stock
GU-0711 M14 parts kit in refinished condition, Federal Ordnance receiver and fiberglass stock
GU-0712 M14 parts kit in refinished condition, Federal Ordnance receiver and desert camouflage fiberglass stock
GU-0713 M14 parts kit in refinished condition, Federal Ordnance receiver and Viet Nam camouflage fiberglass stock
GU-0714 M14 parts kit in refinished condition, Federal Ordnance receiver and woodland camouflage fiberglass stock
GU-0715 M14 with fiberglass stock
GU-0920 M14 with USGI fiberglass stock and rubber butt pad
SE-0221 M14 parts kit with minor wear and USGI walnut stock
SE-0222 M14 parts kit in refinished condition and USGI walnut stock
SE-0223 M14 parts kit in refinished condition and USGI fiberglass stock
SE-0224 M14 parts kit with minor wear and USGI fiberglass stock
SE-0225 M14 parts kit in refinished condition and woodland camouflage fiberglass stock
SE-0226 M14 parts kit in refinished condition and desert camouflage fiberglass stock
SE-0227 M14 parts kit in refinished condition and Viet Nam camouflage fiberglass stock