Gun Tank checks out an early production model the KTW Winchester M70 Black Shadow, a gas bolt-action airsoft rifle made by Hobby Dongsan, noting its metal magazine and aluminum barrel. During the initial examination, the reviewer immediately encounters a gas leak from the valve, which is traced back to a damaged O-ring. He includes a detailed section on replacing this part to successfully fix the leak.

Beyond the initial leak, the reviewer identifies a more significant design flaw where the rifle's cylinder can unintentionally slip out during operation. A simple solution, provided as feedback from the manufacturer, is demonstrated: installing a small spring washer on the bolt release pin to secure the cylinder and resolve the issue.

He concludes by showcasing optional accessories for the rifle, such as sights and a sling swivel, and mentions upcoming parts like a wooden stock and a wide cylinder head from third-party companies. Ultimately, the reviewer praises the domestic production of a gas-powered rifle at this price point despite the minor technical issues that needed addressing.

He also includes an update that production version currently being sold has the issues corrected and is being shipped.