you can put one together for a good price off e-bay, new ca 100 or 125. home made adapter plate and a 70$ cobra regulator . new straps 60$. find a used tank. new lines to size. total about 350$ Ive done it about 5 times. I run a ca 200 or 225 on a 2.4 22r. about 450$ total. That's IMO.. others will all have ideas.