Please forgive my ignorance, as I own a semi-auto, but it's for fun at the range, my carry weapon of choice has always been a wheel gun. What, specifically, is cocked-n-locked? Are you saying you rack a round into the chamber, set the safety and holster the weapon? And walk around like that? It seems foreign to me. I've always carried revolvers with pin-type hammers cowboy (with the chambered cylinder empty), but don't worry so much about that with my S&W 060 as it has a flat-type hammer, and I don't fear the accidental shot. My Baby Eagle has the 1/2-cocked feature. Would it be acceptable to rack the slide, drop the hammer to 1/2, set the safety and carry that way? What components/features does an automatic need to safely be carried c-n-l'd? Is it inherit in all DOA semis, or does the gun require a firing pin block or something?