So I bought one of these guns, and this is what I've found:
- Barrel is heavy wall (590A1 type)
- Safety and trigger guard are polymer (normal for 590)
- Bead sight is matte blued steel, not brass
- No front sling stud and washer included
Parkerized steel parts:
- Barrel (inside and out)
- Magazine tube
- Magazine cap
Blued steel parts:
- Bolt
- Shell lifter
- Magazine follower
The receiver is a matte black meant to mimic Mossberg's matte bluing, so it looks kinda mismatched since the barrel and magazine are parkerized.
The box has a label with the model number 59014 stuck over the top of the original label that bears the model number 50643 (9 shot heat shield), so it appears these are factory 50643 models retrofitted with 14" barrel kits.. Basically it's a 590 receiver with 590A1 parts forward of the receiver (except for the follower, which is usually parkerized in a 590A1).
It's not a bad deal considering the 50643 in original configuration sells for about the same price, plus it's almost impossible to obtain a new factory 14" model due to U.S. export restrictions.