I am actually a new owner of a 590a1 51663. I too received one of those barrels with the front sight issue. I was sent a new barrel in three days, this barrel too has the same problem. I just got off the phone with Mossberg and i am now searching for a way to fix my new shotgun blues....seeming as how it appears their customer service representatives are not too understanding. Now i have two barrels at the house that are useless to me....same thing, wanted the shotgun....wanted the barrel....sent me a new barrel with the postage paid tag....turned out it is even banged over with a mallet to be closer at the top......;.how rediculous.......
When my wife called this morning and the representative believed she wanted to buy a barrel, it was Barbara's understanding that they had plenty. Then, when i am on the phone, they are sadly out of replacement barrels and should have more made in 30 days...... They of course will not send me a third barrel, while my 2nd barrel is afloat......even if they were in stock..... The rep told me however in 30 days, if i ship them my barrel.....leaving me barreless...... include within a letter explaining the whole first barrel issue..... they will get one right out to me.....perfect of course.... I am highly considering just sending a barrel to aimpro and having the sight wacked...a new one installed and pay for the parkerizing so i never have to have a conversation with anyone there again....
So, i found this site while i was researching my current issues....i see there are some more of us experiencing these dilemmas.....it's sad....... i love mossberg too....