Questions on Parker’s

[Phil C]

Here are a few questions I have. Any feedback is appreciated while I search for the answers.

As I understand, Parker never installed Miller triggers.
My question is did Remington?
If not, were Almost all Single triggers made by Miller and installed In Parker’s installed by them?

Has there ever been documentation found were a gun was sent back to Parker or Remington to have the barrels shortened or were all shortened barrels done by the local hack with a saw?
I have always thought all shortened barrels were not factory but with as many cut barrels we find and the large numbers of Parker’s sent to Parker or Remington for repair. Would it not be likely they would also offer this service?

Where was the middle bead installed ? Was it Mid way?

When a gun was sent back to Parker or Remington to make it shoot close ( tighter pattern) how was this accomplished?