Probably the most dreaded sound in an automatic is the Benelli Click. Been there, heard that the first time I called in a turkey with my sbe. Pulled trigger, heard "click" but no "boom". Those turkeys are still running. There's a trick to closing the bolt slowly and quietly. Unless done properly it won't go into battery. The tip-off is the position of the extractor. Letting it close with the noise level of railcars coupling and there is no problem.