Toby,
You are of course correct about who did what in Birmingham and London. My
objective in posing the question was to address a broader issue, Frequently
on this site members launch into passionate debates without first defining
the issue. That said, who 'made this gun?

In 1888, Lancaster sent a set of oval bore .450 barrels to Powell to be fit to
a "lifter' action. Powell supplied all of the other metal pieces as well at a
total cost of £12/10. It was then returned to Lancaster too be completed.
Who made it?
Steve