Concoa Regulator

Hi guys! I really need some expert help! I'm looking at building my own pressurized CO2 system. Would this Concoa regulator be good? Looks like it has a needle valve attached to it. Here is the description:

Concoa - Controls Corporation of America of Virginia Beach, Virginia - This is a used, 400 Series Gas Regulator, Assembly #40223311D, Serial #934423, as pictured. The inlet gage on this regulator is scaled 0-4000 psi, and outlet gage is scaled 0-30 psi. The CGA connection on the high pressure side is not marked as to type, though it looks like a CGA-590 connection, though that is a guess. The discharge of the Regulator has a needle valve, with a compression style fitting for 1/4" tubing.

I'm admittedly very new to this, but I'm really trying to get this right and take it slow if needed. This will be my first aquascaped aquarium and I'm very excited Thanks for any comments!