3M 16587, Accuspray HGP Gun Kit. The 3m, Accuspray HGP Gun Kit is. A HVLP gravity pressurized spray gun, to be used with a pressurized H/O cup system to provide superior application of high viscosity coatings. Each kit contains a HGP spray gun and 4 atomizing heads - 2 each 1.8mm nozzles and 2 each 2.0mm nozzles.