HKS Magazine Speedloaders for centerfire calibers feature a rugged, comfortable, thumb activated cam-lever system that lets you load a 15-round magazine in 18 seconds or less. Rimfire Speedloaders depress and lock the magazine follower in the down position for easy loading.Fits: Glock - 9mm & 40 Caliber pistols 17, 17L, 19, 22, 23Smith and Wesson Sigma 9mm and 40 S&W*Note: The HKS GL940 is not designed for the S&W Sigma, but some customers have reported being able to get it to work well enough for them. FeaturesWorks right or left handed for fast filling of staggered magazinesWill not fit +2 magazinesThis magazine speedloader is for staggered magazines only DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.