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. 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.