I checked out a buddies's rifle yesterday. He told me the bolt does not slam forward with barrel install. We played around with it a little and found that when using a 'normal' amount of twisting force to install the barrel, the bolt stays locked back. If we gave it a good slam-twist, the bolt did go forward. Doesn't appear to be a design flaw. I've done the same thing when I owned a CZ Shadow. Slide locked back, slam home a full mag and the slide would go forward.