Paasche Airbrush Paasche Double Action Siphon Feed Airbrush Set, Multi-Colour, 26.04 x 19.05 x 4.45 cm

Should I buy this or the single action-only airbrush? It will be used for model cars and small firearm components.

What size is the connector on the hose? 1/4 or 1/8?

What's the difference between this and the MIL-set?

what is the difference between vl and ts