An aligning insert add-on for the UpLULA and 22UpLULA loaders. It assists loading single-stack magazines by eliminating wiggling of the mag inside the loader. It connects to and is used with an existing loader, it's not a new loader. Sold separately from the loader. Best for : 1911 .45ACP mags (Using the UpLULA) 9mm single-stack mags (Using the UpLULA) Converted .22LR 1911 mags (Using the 22UpLULA) The 1911AI is useful with mags width less than 14.5mm (0.57?) - wider mags will not fit in Please Note : The 1911AI is useful with mags of width less than 14.5mm (0.57?) - wider mags will not fit in S&W Shield mags do not require the 1911AI with the UpLULA Glock 42 mags do not require the 1911AI with the UpLULA