THIS IS NOT A MAGAZINE, GUN OR AMMO! This magazine loader is designed specifically for the 22LR caliber and is modeled after popular full sized mag loaders. It features side tabs for your fingers to press down with equal force to depress the previous round making the next a breeze to slide in. This mag loader will work on both factory magazines and magazine using the NicTaylor00 and Shockbottle upgrades. So if you have problems loading your 22 mags after removing the factory parts, this mag loader is for you.