I'm supposedly retired...if I take orders for them at all, I get SWAMPED. And then people expect 3-day delivery...making guns is not what I do. I only build stuff that causes HAPPINESS now.

Here's the overview of how the BB drive works, and yes, I've included patterns to mount M249 gearboxes in my creations.
How the mag drive works
Silicone tubing is used to connect the BB drive to the hopup, by the way.