Whatever they call it. They sell you a gun and promise to take care of any defects in worksmanahip or breakage of parts outside “normal wear and tear”. Aside from that being intentionally vague, 2000 rounds of range ammo and 100 rounds of +P in a gun that specifically says +P on the barrel, is not “normal wear and tear”.

I think if he pushes the issue he’ll get some satisfaction. Go over their heads. If they don’t make it right, if make it a point to tell them you’ll never buy another of their products and you’ll make it a point to tell others not to, as well.