USAONEx
Copper BB
Like others I had trouble with my Blackwater 590A1 shooting about a foot low at 25 yards, I have the XS Ghost ring rear with the ,400 front blade on the high front mount, I was afraid it would be a tIght fit but after I removed the set screw I was able to remove it by hand, After cleaning the barrel dove tail with alcohal I applied red loctite and installed an XS ,250 front sight. It appeared good and snug after I centered the sight, Hopefully this will help get me on target at 25 yards since this is my house gun, Anyone else have this Blackwater edition with this issue? Mossberg said that it could be an issue with the barrel but thought I would give this a try first.