I run Citadel 9mm 1911s, which are pretty much Rock Island guns. I only use two types of magazines in them. Either the Wilson ETMs mentioned before, or Metalform removable base plates with Wolff extra power springs put in.
Walkalong, the newer ETM still have the plastic spacer at the rear, the just have a little curl on the front body now.
Skribs, any 9mm 1911 can be made to nose dive like yours in the picture. It is almost always because the slide is advancing too slowly from a full rear retraction. My advice would be to first give the gun another very thorough cleaning. The Armscor guns come with some wicked packing grease that acts like a tacky glue. Make sure you get the rails all cleaned up. Also make sure you pull the extractor and get anything that may have been hiding under the hook or in the channel. Also make sure the bolt face is nice and smooth and clean. Those last two items are because these nose dives often happen when the case can't slide up the bolt face with the rim under the extractor. When that is done, insert your magazine of dummy rounds on a closed slide and give the slide a hard yank to cycle it instead of starting with the slide locked open. If you do get another lockup, just for S&G, give the pistol a good solid whack on the bottom of the grip and see if it jumps into battery. Most times it will.
