08-10-2013, 03:17 AM
Worst I have seen is a dust storm in the Middle East. The sand got into every crevice of every piece of equipment we had, and even shut down our breacher shotguns, in addition to the M24's (Rem 700 long action). When trying to field-strip our M4's, we literally had take-down and pivot pin detents rip out with the track in the pins...yeah, as in the way they can't come out, but did.
When shooting high-volume courses in extreme arctic conditions, I've been surprised at how well the AR15/M4 runs, as long as it is built with true Mil-Spec parts, fed quality brass ammunition, and lubricated with the right lube. If you do take a rifle with you indoors or in a tent in extreme cold, condensation will form on it while in the tent or warmer enclosed space. Once you exit, the condensation freezes almost instantaneously, and will seize your action, and will seize the cartridge in your chamber if it was present in the warm area.
When shooting high-volume courses in extreme arctic conditions, I've been surprised at how well the AR15/M4 runs, as long as it is built with true Mil-Spec parts, fed quality brass ammunition, and lubricated with the right lube. If you do take a rifle with you indoors or in a tent in extreme cold, condensation will form on it while in the tent or warmer enclosed space. Once you exit, the condensation freezes almost instantaneously, and will seize your action, and will seize the cartridge in your chamber if it was present in the warm area.