[ccw9mm]

Since I am not allowed weapons in my place of work I am courious about the affects of repeated exposure to extreme heat and cold on both the weapon and ammo.

Keep it clean and well-lubed. All should be well.

Ammo is self-contained. Though, the exterior surfaces can, over time, develop minor corrosion. But with defensive ammo we're unlikely to be keeping it around forever, particularly inside of a given gun. Rotate the ammo on a reasonably regular basis (something less than 1yr timeframe), and you shouldn't have any problems.

Firearms have metal parts, and not all metal bits in all guns are going to be treated against all environmental conditions equally well. So, just keep your gun clean and free of debris, well-lubed. Occasionally, do a "deep" clean, to get into all the little nooks and crevices, check the springs/bars and other little metal pieces that could, over time, develop little problems here and there. Imagine a gun that's being dunked in salt water frequently, then not cleaned nicely. In time, it'll begin to develop issues. Go after the gun occasionally as though it were that sort of thing, a gun that's been subject to such threats. Treated that way (albeit on a much longer timeframe, given that it's not salt water you're speaking of), it's hard to imagine a given gun's going to give up the ghost with any frequency.

 

[ccw9mm]

They are built for war, hot and cold arent going to hurt them.

Well, some of them are. And on such beasts, I'd agree heat/cold won't affect them much, if at all.

Manufacturing and metallurgy standards evolve, and not all makers implement war-grade utility into all parts at all times in all models of guns. And then, designs can either help or hinder certain problems. Like with simple condensation causing corrosion and sticking of parts, if those exposed parts aren't well-protected, -coated or whatever. Some makes/models of guns are known for not having such issues even when heavily used in horrible conditions (ie, the H&K USP line), or Glocks. Some exhibit corrosion issues at much, much earlier times.

Have had a couple of lower-end pistols that showed far greater wear in short periods of time than every other gun I had, yet I've only been shooting less than 25yrs. Doesn't seem right, yet those couple showed distinct signs of wear, despite being treated as well as every other in the stable. Am assuming I either habitually flubbed the maintenance routine on these two pistols (not likely), or the metallurgy and/or surface protections just weren't up to snuff on them. Same shooter, same conditions, same basic maint/cleaning routines, same storage environment.