i have the same problem right now, my tank wont come out of the screw in thing. Also i cant get my barrel off, i dont see any pins like my brass gun i had b4 this, i cant remember the exact name of my last gun but i got it at walmart, and to take the barel of it had these pin thingys but the ion doeswnt!??!
well guess what... your screwed.
Let me guess the last time you put your tank on you had to twist a little harder.
Congrats you have cross threaded your tank onto your duckbill ASA
The same thing happend to me except.. my local proshop (sponsor) did it to me. Luckily i love my 45/45 tank and my evil on/off so i just never take the tank out of the ASA i just take off the rail and On/off and keep it like that. Sucks for you that you have a duckbill stuck to your tank
If you get your tank off your gonna have to buy a new tank regulator and a new ASA
Cross-Threading is when you screwed in your tank and it was not following the threads, basically when that happens the threads on your tank and duckbill are ruined. Im not sure if you could get an air-smith to possibly re-tap your threads and fix it, but I have no idea and I really wonder how you would have managed to do this. Or assuming you are a boy with no muscles you could just need to spin really hard, hell with the stock duckbill I need to really reaf on the tank to get it past the pin hole.
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It is unlikely you have cross threaded your tank. The threads are fairly large and you woiuld have to be pretty (insert adjective here) to do that.
Sometime the pressure being output from your tank can make it hard to take off. Like the guys above said, dry fire until you tank is empty. Then give it a good twist and once it breaks free, it'll be easy to get off. The go put a bit of grease or oil on the threads of your tank. It's helps. But don't slather it on there...