In CA M-1 Carbines and Garands are legal to buy. Good enough for the 82nd Airborne is probably adequate for any mess that I will see. Lots better than a hinge action shotgun. Of course a hinge action double barrel coach gun with number one shot puts 50 each .30 caliber projectiles down range before you reload, which kind of makes the 10 round magazine limit kind of meaningless.
My remark about anything more than the hinge action shotgun in CA was sarcasm.