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wow, huge pic! Anyway, no, that is not normal. If any part of the regulator starts to unscrew, that is a very bad thing. Since the pic was taken against a dark background, it is difficult to tell at what the arrow is pointing. But, that part of the reg is usually the "bonnet" and there should be one or more set screws to keep it tightened onto the top of the reg. Screw it back onto the reg, then take the tank to your local shop with airsmith and have them look at it.
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