Colt Long Guns
Here's my new CAR-15 Fiberlite reproduction synthetic buttstock from Brownells (trying it on my son's Colt LE6920 M4 carbine), it looks exactly like the Colt Fiberlite stock that I had on my Colt AR-15A2 Sporter II carbine way back in 1985 when I bought it new.
These stocks are mil-spec size...