Quote Originally Posted by Fjallhrafn View Post
Just thought that I'd update this with this thread from 2015: Link.

Short version is that Battlefield Vegas, the big machine gun rental place in Las Vegas, has never once had a milled receiver break. Every stamped gun of every nationality they've run (and they have AKs from everywhere but North Korea, Vietnam, and Cuba) has eventually suffered a cracked front trunion.

However, the trunions on the stamped guns don't generally fail until 80,000-100,000 rounds have been fired through the guns. Receivers very rarely fail, and they typically pull the barrel and trunion once the trunion cracks and install a new trunion and barrel. Romanian WASR barrels are still not shot out enough at this point to keyhole at the relatively close ranges they use.

So there is a theoretical benefit to running a milled gun and that is if you're running tens of thousands of rounds, especially at a cyclic rate.
Given the heat and stress that full-auto mag dumps impose on a gun, rifles fired in semi only ought to last even longer