You bet it does. The result is ugly as a mud fence:
Here the Christy firing pin on my Hy Hunter Western Six Shooter:
And the resulting hammer:
This firing pin was developed by Christy Gun Works of San Francisco in the late 'Forties as a "gas proof" firing pin, and lauded by Keith in his book. It was employed by the Great Western revovlers an standard, though for $8.00 (!) extra, a Colt firing pin could be fitted. Removing the hammer and firing pin assembly and replacing them with a Colt firing pin bushing and hammer was all that was required.
The one shown on E-bay seems to be a little more refined than mine.
It's certainly not original Colt!
I agree about the Christy conversion, which IMHO, is awful on a Colt (but to each , his own), but the entire gun looks more Great Western than Colt! (except for the patent dates on left of frame)
Christy screwed up more Bisleys than SAA's by the way