The Double Eagle has different tolerances than the Well. I own both and it's very annoying. The outer/inner barrels are different. Uses a different bucking. The cylinder head nozzles are different sizes. I haven't tried swapping the cylinder yet. I made the mistake of purchasing the Double Eagle first thinking it was really made by Well. I was wrong. It all looks exactly the same until you try to mix and match parts and they don't fit.A friend recently got me a Double Eagle Shadow Ops Type 96 as a sniper. (He doesn't know much about airsoft) I figured it should be upgradable due to the fact that it's a clone of the WELL MK96. However, I also heard a ton of things about the gun not being upgradable. I'm pretty confused now so yeah. Please help.