Inside the ACEM, each round is pivoting in a continuous sweeping path. The geometry of this path is uniquely designed to align the round under the feed lips of the magazine while simultaneously pushing the already loaded round(s) and follower down into the magazine.
To come up with this geometry was no easy feat. After years of research and development, hundreds of prototypes and tens of thousands of loaded rounds, the ideal geometric values were realized and incorporated into the latest line of ACEM pistol loaders.
The animation illustrates the round's path of travel during the ACEM's operation. A single round is depicted to more clearly show its path of travel. Note how the round is pivoted under-and not forcibly pushed through-the feed flips.