The McFadden Lightnin' Grip Loader is designed to expedite the process of loading .22 LR magazines, preventing sore thumbs.
Specific adapters are available for a variety of .22 LR firearms, including aftermarket 10/22 magazines and models such as Smith & Wesson M&P15-22, Ruger SR22, and Kimber 1911-22 conversion kits.
The product listing specifically mentions adapters for Colt M4 and Beretta ARX16, indicating a wide range of compatibility options provided by McFadden Machine Co. Inc.