Yes,you could put one between the fitting itself and the gun.It just starts to get bulky like that with fitting into fitting into gun or however.
Mainly I was suggesting that you switch from Macro because it's not rated to operate at typical paintball pressures and will have a limited lifespan.Expect a fair share of wear induced leaks at the fittings and after enough time in the sun (UV), increased potential for bursting.
Other that that,it's just fine.
