Yea, we all thought that, Knny. Anything that didn't work properly, was claimed to be the way it was supposed to work.
I recall that my M-14 refused to fire because it got wet ... a bit of an exaggeration there, but it soon developed into a Congressional Investigation and I believe the outcome was .... That's the way it's supposed to work. Keep it dry, Jarhead!
But those were the greatest days of out lives!
In regards to the M-14 (applies to the M16 too).....
It's a double-edged sword in matters of cleanliness.
If they're too dirty...the carbon build-up slows down the action & add a little water....makes it a lot worse.
So....you break it down & clean it "the Marine way" (which any one that has been in the Corps knows that you'll scrub the weapon so much & so detailed, that you can remove all oils & even the bluing from the actual machine parts) which prevent rusting & allows smooth operation. So....you clean it so much....that when it gets wet...it won't cycle because there's no oil between the metal.
I remember a funny story in bootcamp. We sat there on our footlockers scrubbing & scrubbing "our ladies". We must of been there for hours (so it seemed) but when we were "done" you were done. What I mean by that is the Drill Instructors would come in kicking & screaming that you were "done" & you had 3 seconds of 10 seconds left to put your weapon together. Well....that usually means you don't have enough time to even properly lubricate the weapon upon assembly. Anyways....we immediately proceeded to take an afternoon stroll in the rain...(Drill). When we got back inside the squad bay, we immediately practiced drill & counts inside because we also have to know what's expected of final drill if we have to do it indoors because it's different than performing it on the grinder. Anyways...the DI had us perfrom "Inspection Arms" & none of us could get our bolts back because they had seized shut because of lack of oil. Those who could get the bolt back, the bolt wouldn't return in the forward position.
Even in bootcamp....it made the DI's laugh.