Tweco® Spray Master ® V-Series, Air-Cooled MIG Guns. The Spray Master MIG Gun receives Velocity™ Medium and Heavy Duty consumables to create a new line of MIG guns, the Spray Master V-Series. Spray Master V-Series maintains the features that made the original Spray Master legendary. Spray Master V-Series is outfitted with Velocity a revolutionary new approach in MIG consumables that will change the game in terms of welder productivity. Velocity was designed by welders for welders.