MakerShot speed loaders are fine-tuned across more than two-dozen critical dimensions for a specific magazine, resulting in perfect fit, speed, comfort, and durability. This complex technology, developed in the USA, creates high-quality loaders that are simply the fastest and easiest to use. Specifically designed for the advertised firearm model. Clone magazines are likely to work. Magazine NOT included. May be used with thumb from top or with thumb and pointer finger along rim.