Dakota

Hello, I am new to the forum but cannot believe the information and knowledge on here. I do have a quick question that I cannot find information, in detail on. I have a Stoeger M3K. For some reason, whenever the gun goes to load a shell from the mag tube, it will hang up half way out of the tube, stuck on the latch carrier. However; if I rack a shell into the chamber, and release another onto the lift, the gun cycles with no issue, that is until it goes to load the THIRD shell. That is when the shell jams on the latch carrier, partially in the magazine. I called Stoeger and they said it could be any number of things. I've asked around and done as much research as possible, all I've really gathered is an over powered mag spring? mine is an overall of 30.5" with 17.5" out of the tube. I ordered and SBEII spring and follower to test. Please advise if anyone has seen this before.