USED Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension Black 5 SA-ECH-ME-5-BLK. Our unique easy access floor plate design allows you to easily access the spring and follower without having to remove the extension from the magazine body. Specifications for Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension: Manufacturer: Shield Arms Color: Black Magazine Capacity: 5 Round Caliber: 9mm Luger Gun Make: Springfield Armory Gun Model: Springfield Armory Echelon Features of Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension Unique easy access floor plate design to service or clean the magazine body without the need to remove the magazine extension from the magazine body. Index cuts on the extension body to increase grip when coming out of a magazine pouch. Machined from billet 6061 aluminum USPSA compliant (141.25mm) Type 2 anodized Adds 5 rounds to Springfield Echelon Does not require a new spring Fits OEM Springfield Echelon 17-round magazines only Package Contents: Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension What firearm models does the manufacturer say Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension is compatible with? The manufacturer suggests that Shield Arms Echelon 9mm +5 Rounds Pistol Magazine Extension is compatible with Springfield Armory EchelonShield Arms SA-ECH-ME-5-BLK: Echelon 9mm +5 Rounds Pistol Magazine Extension Black