I've fired off a few belts of those. Very boom, such fun. When the Mk19 was finally OK'd for our Scout Platoon, I was one of the ten guys in our unit to go to "beautiful" Camp Shelby, Mississippi for the training course. Still have the manuals somewhere, even though I've been out nearly 20 years. Laying waste to a target 2200 meters distant was seriously cool.
So many irons in the fire right now, but having a really hard time getting most of them moving. No time, no money. I think I might have to just suck it up, annoy my wife, and spend some of both of those to get things launched. Phase 1 is kind of the kick-starter to everything else.