Mossberg made a lot of store brand guns including the Western Field 550, the New Haven 600, the Revelation 310, the Sears Slug Model, Coast to Cost 660.

The Maverick 88 is the former budget model Mossberg, the only difference anymore is the 88 has a cross bolt safety located on the trigger guard and the 500/590 has a tang safety up on the top of the receiver like an old break action shotgun would have had.

They are simple to work on. It's common to see people break the plastic tang safety button especially on the store brand models with the thin checkered safety button. They make metal ones both factory and aftermarket.

Back in the day the Maverick had a cheaper fore end with the action bars pinned right to the plastic handguard versus the 500/590 having an action slide tube with the arms and the fore end slid on the tube with a nut to hold it on. Today though the cheaper fore end is used on all of the plastic stock Mossbergs anymore. The Maverick 88 and the 500 take the same barrels and all other parts except the trigger/safety parts.

The 590 the only real change from a 500 is the magazine tube is open ended like a Remington 870, you can put an extension on it. The 590 uses all the same parts of a 500 except the barrel and magazine tube.

They make a 590-A1 model which is the military spec version with a metal trigger guard instead of plastic. I have seen a few plastic trigger guards break but it's not super common and it's usually abuse.

Mossberg makes two different mag tube lengths for the 88/500, the standard models 5-shell or the Security model 7-shell. However the barrel has to be for the same configuration because the 88/500 barrel has a lug with a thumb screw that secures the barrel to the end of the mag tube. The lug is welded on to match the length of the tube. If you want a Security mag tube you need the matching barrel.

I've never had or seen a 88/500 break the lug, but I have seen the ring style used on Remington 870s and Mossberg 590s break the ring.

Mossberg uses an aluminum receiver which is not an issue because all the receiver does is hold the parts to work the gun. The actual lockup is in the barrel and the bolt like most modern pump shotguns. I've only ever seen one Mossberg receiver wear out, and i shot it so much the slide bars wore through the receiver, this was decades of punishment.

Remington receivers are mostly steel. The thing about them is the ejector breaks and they are riveted in place, so it's a bit more work to repair. Mossberg the ejector is held in with a screw.