If that's true, then what also must be true?

[Vlim]

Ditto on the side plates.

I have a 1917 artillery, side plate is orginal to the gun with a pretty bad, looooong, trigger pull.

When I shot it, I dropped in a recent repro side plate, trigger pull was excellent and very reliable.

Also had a 1906 go full auto after mistakingly installing the wrong 'shooter' firing pin. Interesting experience.