ok 1st off yes u can boost into a scba 4500 from a scuba. But y would u wast all of the air thats allready stored ? Isnt the point to get the air into the gun not your scba . KIND OF BACK ASSWARDS TO ME. Uless u got a gun gready as mine but as i have stated 3600 psi in a 88cft carben fiber tank and a booster n u better pack a lunch a supper heck feed yourself for the weekend .evin boosting your gun to 4900 psi like I do hundreds of shots seth i would think as long as ur not dumping inbetween shots n wasting alot of usable boosted air.DON'T FORGET YOUR INPUT DRIVE AIR CANT EXCEDE 100 PSI USE 90 ITS PLENTY.