Question: are all mossberg 500 barrels interchangeable?
Answer: 270 WIN. All the Mossy 500 series pump shotguns use the same buttstock. That's the Mav 88 and Mav 91, the Mossy 500, the 535, the 590, the 590a1 (both 5+1 and 8+1), the old model 600, and the 835. All of those also use the same style forearm hardware and all are interchangeable.