I bought a mossberg 500a at Bi-mart here in Oregon. Its the one that comes with the two barrels. An 18.5" and a longer one for game. (pics later) I think its the same one they sell at big 5. Anybody know anything about an issue regarding the slide tube thing and the fore grip? I hear the pins pop out and leave you with a non-functional shotgun? Any info would be great. Like if this issue was resolved or if there is something I need to do to fix it. Thanks.