Muay, I am always impressed by your offerings!
So, you have fitted three uppers onto one frame for interchangeability? Just saw vid- OK answered.
I wonder how difficult it was for you to fit the TS upper onto the 75B frame? (similar to fitting a Bull Shadow upper hypothetically?) Just saw vid- OK answered. You bought slide already fitted for a 75B frame.
Did you fit the long barrel for the 75B set up? Is it a 75B diameter barrel or an SP-01 long barrel with corresponding fitting?
Final products look great !
Kudos to your adventurous projects. Thanks for the vid!