Comments by "" (@neutronalchemist3241) on "How Does It Work: Roller Locking" video.

  1. A short recoil action (Browning, Beretta/Walther, or that CZ...) opens that way. Simply the barrel recoils with the slide for the first few mm.
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  2.  @tommasomorandini1982  Nor you can make the rule "it's a delayed blowback if the bolt moves, but the barrel stays still", because in a Revelli action (today used by the FN Five-Seven and the Ruger 57) that's considered a delayed blowback, the barrel recoils, but at a slower pace than the bolt.
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  3. It's more complex than a tilting action, and it has more surface friction, so needing more lubrication.
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  4. A tilting system, being it a tilting barrel like the Browning or a tilting locking block like the Beretta/Walther will always have less surface friction, and so less lubrication needed and/or surface wear.
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