Fits and loads all AR15 / M4 compatible 5.56 x 45mm / .223 magazines using no inserts or adjustments; Loads from 1 to 30 loose rounds in a single stroke; 25 seconds loading 30 rd magazines; Absolutely painless operation; Keeps the magazine lips intact; Allows inspection for defects and cleaning of rounds prior to loading; Safe on fingers and magazine; Easy to operate with gloves in freezing weather; Chemical resistant; Portable, range bag packable