.50 hammer tank problems

I recently bought a Umarex .50 Hammer used for 500 dollars, this is my first air rifle that's not airsoft. I was told there was a leaky fill valve on it, I replaced the Teflon on the threads and she was good to go. I then filled from an SCBA bottle and it immediately leaked from what seemed like the gauge, but I'm realizing it may be the burst disc. Can I replace the burst disc and/or the seal on the gauge, or does it make more sense to get a new tank and replace it? Help me I'm new...
 
No need for a new tank....Could be a burst disc maybe... Hint too for 4500 psi air there is a much better option than Teflon tape...like this is a paste form and good.too 10,000 psi

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I bet it was the 5k burst, mine went with only 2k in the bottle. It's just a Ninja bottle regulator so any disk that fits those are fine.

You need to remove the barrel shroud, then the foregrip, the the foregrip mount piece. That foregrip piece uses two 1/16 Allen screws in the back, you really need a flashlight to see them. Then unscrew the entire bottle from the receiver.

Danger: if the barrel unscrews from the receiver, you may be in for a rough time! Not impossible, but you'll need to dig deeper to get the "barrel nut" out, the mess around with the protrusion to the magazine. I'm not sure how the barrel locks to the "nut" or I'd dig into mine to fix a slightly sloppy spacing issue.
 
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