The Shield Arms PMAG +5 Extension adds 5 rounds to your Magpul PMAG magazine. Their 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.Features :Unique easy access floor plate designIndex cuts on the extension bodyMachined from billet 6061 aluminumType 2 anodizedAdds 5 rounds to gen 2 or gen 3 Magpul PMAGDesigned to work with OEM springProudly made in the USAFits most aftermarket flared mag wellsLifetime warranty