P11.

The UpLULA® loader made by Maglula®, is a military-grade, pocket-size, universal pistol magazine loader and unloader designed to load and unload nearly all 9mm Luger up to .45ACP single and double stack magazines of all manufacturers. It also loads most .380ACP single and double-stack mags, and 1911’s mags. The UpLULA® loader self-adjusts to the magazine and loads it easily, painlessly, and reliably.

This is a polymer sleeve that slides on to the S&W 12 round magazine. Since the larger capacity magazine extends down past the P11 grip, this magazine sleeve was made to fill in the gap.