Shield Arms is Driven by Innovation Adding five rounds of capacity to your Magpul PMAG Gen 3 AR-15 30 round magazine is easy with the Shield Arms +5 Magazine Extension. Machined from billet 6061 aluminum this magazine extension has an Easy Access floor plate that lets you maintain the magazine without removing the extension. The Index Cuts make grasping and removing the magazine effortless. Shield Arms Magpul PMAG Gen 3 Magazine +5 Extension Specifications and Features Shield Arms SA-ME-PMAG5-BLK Replaces OEM Base Plate on Magpul Gen 30 Factory 30 Round Magazines Adds five Rounds to Capacity of Magpul PMAG Gen 3 30 Round Magazines Magazine Extension with Index Cuts Easy Access Floor Plate Works with OEM Spring 6061 Aluminum Type 2 Anodized Black