I have an older 12Ga. Mossberg Watchdog, Mfg#50416, 6 shot, 18.5 barrel and synthetic stocks. It came with a tactical light, laser and a Mossberg mount that clamps on the magazine tube. It's been upgraded with a Magpul MOE forend & rail section, Streamlight TRL-1S and XS Big Dot front sight.
My other 500 is an ancient 12 Ga. "Camo Combo", synthetic stocks, slug barrel with rifle sights and a vent rib barrel with choke tubes. It's primarily used for turkey hunting.
i actually just ordered one through Mossberg and is being delivered to a local shop that i didn't know existed. Tried a few other local shops that weren't Mossy "dealers," and a few big box stores. My 590 will have a little bro soon! Now excited to do a build on it