When do know a rifle is reliable, one you would trust your life on, regardless of specs or maker? The accepted rule of thumb with a 1911 is 500 rnds of FMJ and 200 of your carry ammo with no failures or malfunctions. I have never seen anything on when to trust an AR. Is it so many rounds, a certain mix of steel and brass or maybe working with all types of mags? What do you all think.