I've good exprience with Mossberg customer service once I finally made it past the automated greetings and such.
Only downside is they aren't big on communicating past the intial contact.
As in, I talked to them, shipped my gun to them, and didn't hear anything out of them until the FedEx guy came knocking at the door.
NRA Life Member
Me: "The .45 GAP was an answer to the question nobody asked."
Trooper pal: "Says the guy who thinks .38 Super and 10mm are viable pistol calibers and gets mad when Wal-Mart doesn't have them."