Justin Lee of Daytona Gas Blowback just announced the availability of the DG Drop-in kit for CA SA58 / O.S.W, allowing you to convert this Classic Army AEG into a gas blowback rifle that is tethered to a gas tank. Just like the other releases, you can use existing AEG magazines in a gas blowback rifle, giving you higher capacity magazines. You can get more updates or how to order, especially if you're in the use at TNK Guns.