First Strike Hero tank.

Hey Joe. Pumping sucks! But that is a paintball gun tank. I looked it up. Yes it holds 4500 psi but paintball gun tanks USUALLY let you fill to 800 or 1000 psi I believe. This one did not say what the output pressure was regulated to. So I would not buy that until you find out. Also that little tank will only give you a handfull of fill for your gun. Which means multiple trips to a fill station and the cost will skyrocket. I would save a little more and get a 74 cubic foot tank and will fill your gun probably 30 or 40 times. This sport is expensive but sometimes it is worth waiting to get the right product. I have a 90 cubic inch air venturi tank set up for 2900 psi output. It is great but runs out quick. I just ordered a 98 cubic foot one . Good luck and do lots of research before pulling the trigger!

Agree with above plus... assuming the regulator is meant to directly supply a PB gun, it simply won't work for filling anything beyond a 10m rifle/pistol airgun and even then to minimum requirements. 

Regulator can be changed but figure $100 for a reg, or $200 for a valve as used on dedicated fill tanks.

Beyond that.... If you shoot much.... you'll be going to the PB shop pretty often to get enough air to power the rifle. I think I shoot a lot compared to most but I run my compressor to fill a Great White and a Guppy tank, every 5-10 days...(See AirTanksForSale.com for prices and specs. There are others but that's what I have.)

Cost vs benefit is up to you. Tanks and fills are expensive.... Pumps are work but less cost (and need to be rebuilt eventually, but then again.... so do compressors. I'm up to 6 years maint free but also have the 'investment' in the scuba compressor...) My compressor cost about the same as 20 (good) new pumps would have....