ProMag Polymer Rifle Magazine MKA 1923 12 Guage 2 3/4in 15-Round Black 15RD. The follower is injection molded and the magazine spring formed from heat treated chrome silicon wire. Specifications for ProMag Polymer MKA 1923 12 Guage 2 3/4in 15-Round Shotgun Magazine: Manufacturer: ProMag Color: Black Fabric/Material: Polymer Magazine Capacity: 15 Round Gauge: 12 Gun Make: Akdal Gun Model: Akdal MKA 1923 Package Contents: ProMag Polymer MKA 1923 12 Guage 2 3/4in 15-Round Shotgun Magazine What firearm models does the manufacturer say ProMag Polymer MKA 1923 12 Guage 2 3/4in 15-Round Shotgun Magazine is compatible with? The manufacturer suggests that ProMag Polymer MKA 1923 12 Guage 2 3/4in 15-Round Shotgun Magazine is compatible with Akdal MKA 1923ProMag MKA-A4-15RD: Polymer Rifle Magazine MKA 1923 12 Guage 2 3/4in 15-Round Black