Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine Black 1 Pack. This magazine is for STK100 models chambered in 9mm and holds 17 rounds of ammunition. It is made of polymer/steel and is made to Armscor/Rock Island Armory specifications and tolerances using the same manufacturing and materials as the original equipment magazines ensuring perfect fit and operation. Specifications for Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine: Manufacturer: Armscor Precision Inc Gun Make: Rock Island Armory Gun Model: Rock Island Armory STK100 Caliber: 9mm Luger Magazine Capacity: 17 Round Color: Black Quantity: 1 Fabric/Material: Steel Features of Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine 9mm 17 rounds Steel/polymer magazine body Fits RIA STK chambered in 9mm Package Contents: Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine What firearm models does the manufacturer say Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine is compatible with? The manufacturer suggests that Armscor Precision Inc RIA-MAG STK100 9mm 17 Round Pistol Magazine is compatible with Rock Island Armory STK100Armscor Precision Inc STK10017-17RD: RIA-MAG STK100 9mm 17 Round Pistol Magazine Black 1 Pack