Going through my backlog of blasters and making some more overviews. This one's unique function is that it has a mechanical long throw pusher, which allows it to do a form of 2 round burst... but instead of halving the number of shots you get, we maintain the mag capacity and double the number of darts fired.
The design is a replica of the xr2 from Call of Duty Black Ops 3, which I never really played. It's a sweeet design though.
Now... if it works is a little debatable. It works, but it lacks the level of reliability that I'd hoped for. It's fun, but I probably wouldn't recommend it to most people.
Files: https://www.thingiverse.com/thing: 3651908
Beta Gameplay: /watch/wKPDjphn8tjnD