Karen, yes, that's correct:
NO Shooting Stars or Power Mags by Chip McCormick. Period.
Bad for aluminum frames!
ColColt, the seven shot Checkmates with the dimple and open front are fine with aluminum, vanadium, skankium, scandium, or byzantium frames. Tongue in cheek, a bit, but they're fine.
Let's correct some misstatements about followers:
Long before plastic followers existed, the standard length grip, seven shot magazine follower was the only type extant, and the aluminum framed 1911 existed long before plastic followered or full front skirted magazines. The long rear skirt prevented any problems, and did not ding aluminum frames. This same follower would be found in flush fit, six shot short grip 1911 magazines.
This follower is
not bad for aluminum frames, despite what was said earlier about it being a poor choice. The reason is that its longer rear skirt has more spring coils bearing against it, preventing it from nosediving into the aluminum frame on the last shot.
Since I'm mostly correcting Joshua's post, I refer you to his pictures earlier. The
ONLY follower pictured that will gouge aluminum frames is the type identified as the McCormick.
Reason? The short rear skirt has too few spring coils bearing against it. Allows it to tip forward. Try tipping a seven shot magazine follower forward......I invite you to try. You can't.
You also can't do this with a seven shot follower. You can with a McCormick follower in a Shooting Star or a Power Mag, found in eight shot full size grip, or seven short short grip 1911's:
The McCormick follower is the shape it is because it was designed to fit an eighth shot in a flush fit magazine. To make the room for the extra round, the skirt has to be shorter to let the follower get closer to the bottom of the magazine. The tradeoff for one more shot wasn't worth it, because even Chip McCormick will tell you, indirectly, that his follower isn't very good. The Power Mag Plus is proof of that last statement.