Loading the larger AR-15 magazines (30-40 rounds), there is a tendency for bungled feeds because the magazines do not fit tightly into the feed opening on the left end, and the slightest movement results in the ammo piling up above the magazine. It works fine on magazines of <30 round capacity. I have some arthritis in my loading thumb, and my personal advantage of the Podavach ULoader, is that it eliminates the unwanted pain of manual magazine loading, and having to stop about every 15 rounds t...