Combustion or Pneumatic

[Specialist]

bad idea you probably wont have enough money for a pneumatic a combustion gun starting from nothing can cost $45-$50 id go combustion its cheaper and in most cases easier to make and more realistic.

[FeLeX]

Umm That piston gun would cost me only about 15 dollars because I already have the parts from the other gun and if I was to make combustion I would make propane injection so that would just by itself cost me 35ish dollars + the gun and all it would give me is kick back, some noise, and muzzle flash.