Picked one up a couple months ago. Finally took it out.
25 rounds of Federal #8 birdshot
25 rounds of Federal #4 duck
25 rounds of Winchester 3 inch BB Goose (ouch)
10 rounds of Fiocchi 00
5 rounds of Federal 00
Only one failure to eject with the Winchester.
Turns out the mag follower would hangup on the Choate magazine extension. Which has been sent back to Mossberg for a replacement. Will not do any mods until its running good.
Brownells carries the latest NC clamp for the Mossberg.