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My understanding is that most parts are. Barrels are not. The 590 has metal trigger components and safety, where the 500 uses plastic. But as @Stomper noted, you can swap those out on a 500 with the metal components if you want.
I bought the metal trigger packs off Brownell's, years ago. After YEARS AND YEARS, I actually managed to beak the plastic trigger guard on my first M500, so I make it a priority to upgrade that part ASAP... although I have enough and won't be buying anymore M500's... LOL
FYI- The M930 series (at least my two specimens do) already has a metal trigger group (I wonder if they'll cheap out and go plastic some day)
Barrels and mag-tubes are the only incompatible difference between the M500 & 590 series, but the receivers will take either/or.
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