Orphanedcowboy

Nope, barrels vary manufacturer to manufacture, but unless they are bent, most are just as accurate as the next offering

Here ya go: Mossberg 930/935 trigger disassembly/reassembly w/ PICS Chuck beat me to it

Guncat has done one for me and it has been phenomenal! I will never use any one else for barrel work!

Well it isn't the gas ring, it is the spring. I made a tool to remove and re-install the spring and gas ring. I remove about 3/16" off of each end of the spring, it hasn't affected the gun in anyway. This made barrel installation and removal a breeze. I contemplated making a sleeve like the one SRM makes for the FN piston to see what would happen.

This was borrowed from Shawn/VA Hunter at Old Gobbler: Barrel Polishing Try this before buying a flexhone:

I will pull mine and get with several people and see what we can source for it. Why would the spring be restricted but not the firing pin?

^^^^^^^^^ He did my 930 with Invector/Win-Choke/Accu-chokes and it is spot on perfect as far as patterning go. The best prices I have fopund on extended tubes were at Manventure Outpost for Trulock Precision Hunter tubes, $27 plus a little shipping

I would think that the pin shouldn't mushroom at all. I have several guns with literally 10's of thousands of rounds that show no signs of wear.

The material the follower is made out of is soft, go back and try the factory metal follower and I suspect you issue will go away. My Benellis had to have followers after 2 seasons of duck and goose hunting, got to where they wouldn't feed correctly, went with SRM's and haven't had an issue since.

Have you inspected the round prior to firing? After it has cycled thru a full mag tube of rounds? Maybe the follower is beating it up causing it to swell, rim is beat up, gun not fully going to battery, rough chamber needing polish? Is the follower the factory follower or aftermarket? It maybe protruding from the tube hanging up on the shell shop putting extra pressure on the bolt?

I have one that I bought in March that now has close to 3500 rounds thru it and the pin has began to mushroom. I called Mossberg and they initially wanted my to send the gun in, I asked for a supervisor and explained the process for swapping it and he agreed it would be the most cost effective to just send me a couple of pins. Kudos to her! Have any of you guys been looking at you pin, if so have you noticed it mushrooming? I have seen this with 935s in the past, but this is the first 930, even though they use the same pin. I am specifically interested in the JM Pro and Rhythm series pins, I wonder if they are different like the gas piston and magazine tube? I also know that if you use Slip 2000 piston and choke cleaner, you will no longer have any finish on your piston, but it will be sparkling clean!

If the front sight worries you, you could use a set that has a front sight attached with a screw: Tru-Glo TG950

We have lead and steel tape, just checked one is .008" and the other is .012". I could care less about the play myself.

What are you using for sights? If you are using just the front bead you need to check you fit. If you are using multiple bead sights, like a turkey sight, check to see where it hits at 16yds and adjust accordingly. I check for fit at 16 yds by firing multiple rds at a Target dot until a definite hole emerges and see where the hole is in relation to the target.