the gun works great...until i go to elevate the last shell into the chamber, the plastic cup that seats against the crimps of the shell sticks just enough into the tube to not fully push the shell out and onto the elevator, the spring feels a bit week also, are these springs known for wearing out and are they replaceable? looks like the shell tube has large threads that screw into the receiver but ill be damned if i cant get that thing to twist and unscrew!
The tube will unscrew, but not easily the first time it comes off. When the mag springs in our department Mossbergs get tired, we replace them with Remington 870 mag springs and they seem to hold up better. Field strip the shotgun. Put the end of the mag tube in a vise and clamp down ONLY on the little rectangle on the end of the tube (NEVER on the tube itself). Insert the wooden handle.of your hammer into the receiver as close to the barrel mount as you can. Evenly as possible rotate counterclockwise. Remember, it's not going to come off easily. When it lets go, remove the tube, the follower and the spring. Do not try to just stretch out the spring a little. It won't work. Replace the spring and put the follower back in. put the tube back on the receiver. I find it easier to push the follower into the tube a little until you get the threads started. be careful not to crossthread. tighten it up the same way you took it off.
