HKS Magazine Speedloaders The HKS Speed Loader is capable of loading 15 rounds in 18 seconds. Faster and easier than ever before, the HKS magazine speed loader quickly loads single or double stack magazines. Simple to use: magazine slips into loader and is held by hand. Depress thumb lever and load. If your pistol is not specifically listed, the magloader may not fit--check with the gun manufacturer. If the magazine dimensions are the same as a listed pistol, then they may use the same mag loader. If your magazine is non-standard, the speedloader may not fit. Make sure you understand the difference between single-stack and double-stack.