I have a Model 870 Express Synthetic Tactical 7 Round shotgun. I want to do some wing shooting so yesterday I received a 28" Remington vent rib barrel. I swapped it out and used the tactical magazine spacer to seat everything properly, checked the action, etc. and everything seemed to be good to go. I fired a few rounds through it and both jammed in the barrel. I assumed it just that the chamber needed to be cleaned up so this morning I used some 0000 steel wool/oil on a bore brush/drill to get a nice mirror finish. So then I truck out to the woods, set everything up and the action will not lock up with the 28" barrel. I can't see how anything I did would have caused this, but since it was locking in battery yesterday it must have been something? The bolt slides forward and hits something solid about 2mm short of battery. I gave it a few taps so I could remove everything and look for any knicks, but everything looks fine. I can swap the 18" barrel back on and the action is perfect again. The barrel is seating all the way back into the receiver and for all intents and purposes, it looks exactly the way the 18" does; both side by side and locked into the receiver. I have removed the trigger group and still had the same problem so I've ruled that out.
Any idea what I'm dealing with?
Any idea what I'm dealing with?