I've also seen the tubes that extend beyond the barrel. My own magazine tube extends about an inch past the end of the barrel. However, 16 2.75" shells (I think that this is the shortest shell allowed in USPSA shotgun stages) equals a tube of 44" plus the space required for the compressed spring and the follower. If you shoot a barrel of 30" then you have 14" + of mag tube extending beyond the end of the barrel. Now, I don't shoot 3-gun as much as pistol, but I have never seen this. Is this really happening, or am I missing something???
"Those who live by the sword are probably pretty f***ing good at it."
"Instructions for a successful gunfight: Front Sight, Press Trigger, repeat
as necessary." - B. Braxton