Great vids. Love the T-Rex and I really love that last one of the M-60E4. I've always loved the M-60 and when the origional E mod came out I really fell in love with it, but then was pulled for problems with the barrel. Great that they have those ironed out now.
As a retired weapons instructor though, I can't say as I like that XM-8. After years of teaching people to keep their fingers out of the trigger guard unless they are on target and willing to shoot, placing both the magazine catch and the bolt catch inside of the trigger guard just seems like an accident looking for a place to happen. With the current M-16's and M-4's there are hundreds of accidental discharges every year and their controls are no were near the trigger. Just imagine what could happen with just a momentary lapse in concentration with a weapon that has all of the controls inside the trigger guard.
OK, I'm off my soap box.
I also really liked the Corner Shot. I was amazed that the recoil of the 40mm was that controlable. Totally sweet, and much safer than the old method, spray a few rounds to make people duck, then expose and fire aimed.