Replying to combo gun

i think i might build a combo gun

would it be the easyest/cheepest to build?

also when odering the 2 nozels form mcmaster (4002 4003) what ange do you specifiy because it says Depending on the spray angle you choose, these nozzles will provide high-impact spray in a solid stream (0° spray angle) or flat fan spray angle. Maximum pressure is 4000 psi. To Order: Please specify spray angle: for solid stream, 0° ; for flat fan, 15° , 25° , 40° , or 65° .
Stainless Steel Nozzles- Constructed entirely of Type 416 stainless steel. Maximum temperature is 700° F. To Order: Please specify pipe size connection where necessary: 1/8' or 1/4' NPT male.
Stainless Steel Nozzles with Tungsten Carbide Insert- Type 303 stainless steel body with a tungsten carbide insert for superior erosion resistance, abrasion resistance, and maximum orifice wear. Maximum temperature is 200°

thanks