Stinger frames are not compatible with any of the original hand cannon barrels like the ones we sell on our website.

Further, Stinger frames and barrels are not compatible between the original, black, aluminum Stinger frame and the newer, steel, Stinger RS frame.

There is a noticible ridge on the top of the barrel of the orginal Stinger frame that was put there to accomodate the steel breechface we put onto the alimunim frame.  Without that bump, the steel barrel would flip back and rest on the hammer.  
On the Stinger RS, we took the ridge off because the breechface is a different shape.  If the ridge was still there, the barrel on the Stinger RS would not open far enough for proper loading and unloading.