I called almost a year ago, for a 500 manual (I had no printer at the time, and I like reading them... I also used to read the cereal box while I was eating as a kid, though so maybe I'm weird).
Still haven't received it. Have no need for it now. But the guy was hesitant to send it to me, and kept trying to refer me to the mossberg owners club thats near me. I also was unfamiliar with the Slugster barrel, and he could not provide me any info on it...
However, I now have a 590 that is setup like a 590A1, and was thinking about calling them to try to obtain a metal trigger guard, and see if the 590A1 is a 8+1 like the 590, or if there was a different tube spring I needed for that extra round, as most folks say the 590A1 is 9 shot.
One thing can be said, they make excellent guns. They may not be the prettiest, nor hold the best resale value, but they shoot well, hold up forever, and are easy to service. I love my 500 and 590. I don't get all the "love" for the Remmy 870 for a few hundred more.