Magpul P-Mag with Installed Endomag 9mm Insert 10rd

Key Functions

• No modifications to your 5.56x45 lower!  Changing calibers is now simply a complete 9mm upper for your AR platform. No nuts, no bolts, no drilling, no bull.
• Last round bolt-hold open feature, just as an AR15 should function.
• Built-in ejector designed to perform under intense conditions.
• Convert your 5.56x45 PMAG to 9mm in seconds, and easily convert back to 5.56 without damaging your PMAG. No permanent changes to anything!
• Specially formulated polymer.