Butler creek has three ways to load msr magazines and none involve your thumbs.The butler creek asap universal ar15/m16 magazine loader fills up mags almost as fast as they can be emptied.Loose ammo can be loaded one round at a time with a simple click or engage the loading arm to expedite the process.The loading arm can handle up to 10 rounds of loose ammo, or ammo in a stripper clip, and the rounds are locked into the mag with a quick push.Spend more time shooting, and less time reloading.Caliber: 223 RemFinish: BlackModel: ASAPMaterial: PolymerType: Magazine LoaderModel Fit: AR-15Capacity: 0