Comments by "" (@williestyle35) on "Calico Light Weapons System: Roller Delay and Helical Drums" video.

  1. The cartridge is held in the helical magazine by the one spring loaded feed lip. The bolt face has an extractor to clip over the rim of the cartridge as it is pushed out of the helical magazine. Till the cartridge is in the feed position, it is held by the flat parts of the bolt carrier. The cartridge is never really free to fall out, till the ejector rod hits it ( where the cartridge is rear of the feed position ). The square surfaces don't make much different from any other gun. The one metal spring loaded feed lip is rounded at the corner that is pushed by the bolt. The bolt is square shaped because the rollers on the sides "lock" ( delay blowback ) the bolt in place, so the flat bolt front only has to sit flush against the trunion or breech face to function. You can see most of it as Ian is disassembling the pistol, but he didn't fully explain it all or show the inner angled surfaces that make the rollers "lock" in the receiver.
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