Shield Arms +5 Magazine Extension, Aluminum, Anodized Finish, Gray, Fits Springfield Echelon ECH-ME-5-GREY The Shield Arms Springfield Echelon Magazine Extension adds 5 rounds to your Springfield Echelon magazine. The 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. Comes with a 100% lifetime warranty. Pre-installed option available on an OEM magazine.