Mechanical Hoppers?

[tetsu_no_usagi]

I'm surprised no one has brought up the Q Loader pods. Oh wait, those were a bigger PITA than anything else described here, and more finicky than a Warp Feed system. Never mind, carry on.

[un2xs]

Bump. (So its not buried too far down the stack.)

[Painthappy]

You turn the knob in the back and let er fly
https://vmechsports.com/

[Cdn_Cuda]

Guy at the field I play at had one. So loud! Sounded like an egg timer

[Trbo323]

I've always wondered why they went with a wind knob over a pull string. Seems an odd choice.

I would love to see something like a rotor but pneumatic. The way it works you only have to wind up the rotor. So take something like a cyclone piston assembly and rig that onto where the rotor gears turn and just make sure it can't go backwards. Bam, pneumatic force feed without the jackhammer action of the cyclone