I was lucky with a better sales experience. When I questioned the beam, my seller sent me a free replacement, which was about the same. Then, when I asked how much to keep both - rather than return one, the seller gave me a deep discount on the second one.
I think that the quality is good enough that the new head doesn't look out of place with the Stinger body.
I did have the inner threaded collar - that secures the lens and connects the head to the Stinger - come loose. Applied thread locker and it seems to be OK.