I am not a huge fan of either show, but I like Sons of Guns more. For whatever reason, I can at least watch most of that show, were on American Guns, I just do not like ONE person on the show. As for the M2 episode, I could have sworn that they did talk about the head space and timing, but they did not have a gauge, cause they kept messing with it. Heck, I still remember the head space and timing of my M2 from 04, even though I gauged it everytime I took the barrel on and off. Never want to get that wrong before a fire fight.