Contributing factor 1: Let's face it, Rayvens are so 2012. They have all their rough edges, cage alignment problems, vibration problems, ergonomic problems, janky trigger linkages and just general malaise about them. They are semi-auto, and expensive, and as of right now, their availability is low.
About the only outstanding feature of the Rayven system is that it is (prior to the 2015 Crossbolt) the only bullpup, magfed nerf gun you can buy off the shelf.
Now, I don't mind bullpups. I would not want to fight exclusively with them, because I find standard layouts are far better with mag changes and intuitive handling despite the length efficiency and inertia shortcomings - but I really don't mind bullpups at all. I just don't care for semi-autos nor the aggravating and dated Rayven.
Contributing factor 2: My RapidPistol is down. I smoked my RS motors after a year of bashing. I was happy with the perfomance of the weapon but not its ergonomics. I want a new secondary that will handle and carry more like a Rayven. I am considering selling my RapidPistol (with a FK swap) and replacing it with something.
Contributing factor 3: There is a standardization program underway within the squad (details not to be posted). Discussion of the upgrade path for a Rayven-wielding scout led to mention of a Rayven full auto conversion with RS parts, which I countered by suggesting a bullpup RS, getting rid of all the Rayven hardware completely.
Enter the XM198 Vulture: