Shield Arms S15 5-Rounds Pistol Magazine Extension Red 5RD. Our unique easy access floor plate design allows you to quickly access the spring and follower without having to remove the extension from the magazine body. Specifications for Shield Arms S15 9mm +2 Rounds Pistol Magazine Extension: Manufacturer: Shield Arms Fabric/Material: Billet 6061 Aluminum Magazine Capacity: 5 Round Condition: Factory DEMO Package Contents: Shield Arms S15 9mm +2 Rounds Pistol Magazine Extension Shield Arms SAS15ME5RED-5RD: S15 5-Rounds Pistol Magazine Extension Red