It'll need Hydro tested. Any dive shop would know where to do it, maybe even your local welding gas supplier or Fire Station can assist.about $20-30 and good for 5 years if it passes. I say snag it... price is right.
To visually inspect and hydrostatic test a scuba is $65 to $80 in the Dallas area. Still that's pretty cheap. You still need the yoke and fill hose with the probe for your rifle. Note that it may not pass, also note that some models cannot be recertified. You still need a yoke and fill hose, and probe / adapter for your rifle.