MKA 01 is a 10-rd box-magazine designed for the Akdal MKA 1919 12-gauge 2-3/4? & 3" shotgun. The magazine body-cover and follower are constructed of a proprietary DuPont Zytel? based polymer to ensure a long service life; with a heat-treated steel tower insert for positive lock-in, and reliable feeding. The spring is made from heat treated Chrome-silicon wire. The magazine is designed for the use of 12-gauge, 2-3/4 inch shells. Made in the U.S.A.