Are Remington model 11 barrels interchangable with Browning auto 5 barrels?
Browning barrels will not work in Remington or Savage, and vice
versa. The big stumbling block is the ejector. On the Remington and
Savage the ejector is a single hook brazed to the rear of the
barrel extension. On the Browning the ejector is a pair of hooks.
The bolts of each are slotted to fit their proper ejector. The
wrong barrel won't clear the bolt and the ejector will get hammered
if you try.
Barrels of the Remington and Savage shotguns have a limited
potential to be interchangeable, due to the shell stop cam cuts.
The cam cuts are beveled notches on the exterior of the barrel
extension. They work the cartridge stop that prevents a second
shell from feeding out of the magazine.
Slight variations of dimensions through the decades allows some
barrels to work in both models. Like I said, "some". Most do not.
The only way to be sure is to try it. Frist, try feeding dummy
rounds, and if that works then test fire. The best idea is to buy
the correct barrel for your gun.
Information from Gunsmithing: Shotguns, by Sweeney.