replacement

Just out of pure curiosity, what firearm companies cover normal wear and tear as part of their warranties; for example, a cracked frame or slide that's been completely worn out from shooting 300k rounds, or something like that? I'm curious to know specifically Glock, Ruger, Sig, Kahr, and Smith...

I have a Shultz and Larsen M70 target rifle. Some time last year, I was shooting and the firing pin broke off about 1/4" in from the bolt face. I took it apon myself to make a temporary fix by using a pop rivet stem as the missing half of the firing pin. So far I've ran a good 600 rounds through...