The locking block just happens to be the entire piece this Guin is built around, so I would say it's a big deal. I saw it broken. Gun locked up on the last stage of a match with two targets left. Couldn't even rack the slide. Huge deal if you ask me. If that was a major and he had no back up gun, that's it! 9 Major gun running running 175PF, nothing crazy. I'm just letting people know and for it to show for the record because you know PT isn't going to broadcast that crap, they think their sh** don’t stink. You're welcome.