HKS 22-B Caliber 22 Long Rifle Magazine Speedloader for Browning Buck Mark, Challenger II, Colt, Ruger 2245, Mitchell Arms, (High Standard) Capable of loading 15 rounds in 18 seconds; Made in USA Loads .22 caliber long rifle magazines Magazine slips into loader and is held in by hand Thumb lever Fits Browning Buck Mark, Challenger II, Colt, Ruger 2245, Mitchell Arms (High Standard)