I just received (01/24/2012) another 930 HD model and the blue spring in the barrel lug is galling/gouging the magazine. The very tip of the spring is turned into the center and the tip is digging into the magazine tube. It also makes removing the barrel almost impossible, the tip of the spring hangs up on the magazine cap threads. This is the 2nd one, previous one was a 930 Field. I called Mossberg and they emailed a return label. I quizzed the lady and she was unaware of any reported issues like mine.
I just wondered if anyone else has had the same issue. It was apparent that it left the factory like this, because the magazine tube was already gouged prior to removing the barrel. I will snap some pictures and post them in the morning to clarify my issue if I am confusing anyone.
Found this on another forum:
As far as people having issues with the scoring on the mag tube when the barrel is unmounted and mounted, I can just about guarantee that it is a metal ring "inside" the barrels gas port tube.
If you were to disassemble that large front nut on the barrel, there is a large HEAVY duty spring. Under that spring is a steel ring, chamford or tapared on one side. That tapered side should be facing towards the chamber or rear of the barrel, while the flat part should be against the spring to support the springs surface area.
While that barrel nut is being tightened down, that tapered steel ring can easily shift to one side or the other. Off center is the best way of saying it I guess. This can easily cause a slight barrel misalignment and scoring on the mag tube as you install/remove the barrel. If it is correctly centered, the barrel will slide on and off easily.
I had to loosen the barrel nut and use a large screwdriver through the tube and gently pressed against the rings edge with the side of the screwdriver to center it up. The first time I tried to install my 24" slug barrel, I couldn't even get it on because that ring was out of alignment inside the tube.
I will add that due to the strength of the spring, unless you have a plan to put it back together, I don't recommend taking it completely apart. It is very difficult to get back together again. I would just loosen the nut until I could move the ring inside. Hope that helps someone.
I was getting some light scoring(more like scratching)on my 930SPX magazine tube causing some interference when removing or installing the barrel. What I did was go to Lowe's and find a wooden dowel as close to the diameter of my magazine tube as I could. With the gas piston out of the gas cylinder I inserted the wooden dowel and moved it around to center what ever was out of alignment when I heard a click. I’m thinking want ever was out of alignment went back into place. Not sure what I did but all I know is my barrel is 100% easier to remove or install. This little issue in no way effected the performance of the gun. Except for a few hiccups I caused my SPX as been running 100% from day one.
Edited by Orphanedcowboy, 25 January 2012 - 03:36 AM.