Would be a bit less than a 1oz. tank (about 28gr. per ounce) but it should work.
For that matter, for a whole lot less money, the single 12gr. adapters sold for paintballers also work....and I think you can find them for about $15. Are time when you just want to shoot 10 or 15 shots...can keep this ready to go, just need to screw the outer tube down to pirece a 12gr., and you're good for a few shots (works like a Crosman...it pressed the 12gr. into a piercing pin and a seal, keeping it jammed against the seal...hasn't given me any trouble).

Just checked...that one was made by Brass Eagle and sold for about $10....but are getting harder to find now. Action Villiage is out of stock, but will take a look at some of the other sites (esp. the ones that have a "Stock Class" paintball following).