Was he lucky?... No and I'll tell you why...
The G17 is 9mm and the G23 is 40cal... Mixing the slides up and putting them on the opposite frames won't damage the gun... Also the rounds are different sized, the G17 won't accept a 40cal round and therefore would not go into battery however the G23 will accept a 9mm, there would be bulging on the 9mm brass if/when fired but no severe problems... the only damage done here was to the operators pride... Cleaning multiple guns at a time is fine as many people including myself do it as a peaceful relaxation or even therapy but you must keep everything separated, sounds like the OP's organization method needs some work but overall he's fine... So as I said before, no he wasn't lucky cause there really wasn't a huge issue other than the points mentioned above
Last edited by nyycanseco33; 01-30-2012 at 07:54 PM.