The M1A1 carbine is modeled after a late production 1944 M1A1 Paratrooper model with a folding “low wood” walnut stock” type two barrel band” and includes the same adjustable sights which were actually introduced in 1944.
Inland M1A1 Paratrooper Carbine, Semi-automatic Rifle, 30 Carbine, 18″ Barrel, Black Finish, Folding Wire Stock, Adjustable Rear Sights, 1-15Rd Magazine ILM150
