As a point of reference, cylinders with solid "bushings" obviously appear wait a solid protrusion at the front of the cylinder. Normally without any machining. Really really obvious the thing is not really a bushing, just a machined extension fo the cylinder. Looking at the star (ratchet) end, you will not see any form of "seam." Removable bushings will have a groove machined in front of the cylinder that is intended to deflect gun gas. Correctly fitted, the bushing will turn freely and smoothly in the cylinder.
I do not know of Andy USFA guns produced without removable bushings.