My personal. The M 16 is junk in a wet climate, and even when kept reasonably clean, may or may not function due to impingment of direct gases on the bolt/carrier. Seems that they are not quite as cranky in dry climate, but question sustained fire in full mode. The Glock doesn't seem to have that problem, and I have seen a video of a 500,000 round test on one in the .45 ACP caliber, run without attention, and abuse by most standards. While very little attention to the Glocks maintenance seems to be needed, I clean mine after each use, necessary or not. Also served in the Corps, and perhaps an overkill habit on the cleaning. I own four Model 22s and a 27, and never had a malfunction with any of them. My duty Glock 22, gets a lot of rounds through it. A couple of drops of spread out oil on contact points, after a cleaning, a wipe down, and I'm good to go.