A continuous motion, end loading packaging machine (10) forms article groups of a predetermined number and configuration using a flight type article selector (16). The packaging machine (10) is flexible in its ability to package articles of different heights and diameters in various product configurations. The packaging machine (10) includes adjustable guide rails (34) to selectively change product infeed lane widths. The machine (10) also includes means to phase adjust the selector flights (60) and allows for easy selector flight replacement.