[Narcoleptic Warrior]

1st question:

I recently installed a tac star barrel clamp and mag extention on my gun. I notice that after running two magazine tubes full of shells through the gun, the barrel extention comes loose and starts to move forward toward the sighting bead. I'm pretty sure that I firmly tightened the barrel clamp when I first put it on. What else can I do to ensure that it stays put?

2nd question (for pump guns):

Any of you guys ever experienced shells sticking in the mag tube? What I mean is that you chamber a shell, fire and pump the forend, positively extract the spent shell but find that the new round is still stuck in the magazine? An extra pump is then required to chamber the stuck shell. This often happens on a full magazine load or with heavy recoiling shells.