looks like a threaded venturi tip,
that could potentially get shot into your barrel one day if not properly secured.
does the power tube unscrew from the valve?
Any chance you can weight it? Shot in the dark, but might be a titanium valve. I always weight any classic valve I come across. Great find BTW. Never seen one of those bolts before but like KNM said it might have been a hazard if it shot out. That's what happened to the "Super Bolt."
U should weigh it. Xmt has experience with titanium he might b able to help