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 Post subject: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 4:19 pm 
Utility Grade

Joined: Mon Nov 23, 2009 8:45 pm
Posts: 8
Location: Chandler In
On the part , item 26 gas piston assembly , are the seal rings that rotate around on the part , split with a small gap , for assembly , or if there is a gap , they are broken ?

I have cleaned the gun several times , but I suppose because of my eyesight , I never before noticed the really really small gap in the rings , so I thought maybe they had to be a open ring for assembly ?

Thanks for looking at your 930 :?




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 Post subject: Re: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 5:46 pm 
Tournament Grade

Joined: Sun Dec 09, 2007 2:32 pm
Posts: 293
Location: Tampa Fl.
The sealing rings have a gap just like piston rings in a car. The other seal ring does too. When I reassembly the gas piston I try to orient the gaps so they are not lined up with each other. It shouldn't matter but I do it anyway. Make sure the rings rotate on the piston easily and that the piston moves easily in the sleeve on the barrel also.


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 Post subject: Re: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 7:21 pm 
Tournament Grade
User avatar

Joined: Sun Aug 23, 2009 11:34 am
Posts: 110
Mine always had gaps in them, and I've never even thought about making sure the 2 gaps line up. It's been going flawless for probably 5k trap rounds.

_________________
- It's all fun and games until someone looses an eye...then the game becomes "find the eye".
- I love the smell of gunpowder in the morning...and Hoppe's #9 in the afternoon.
- Proud owner of a Mossberg 930.


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 Post subject: Re: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 7:40 pm 
Utility Grade

Joined: Mon Nov 23, 2009 8:45 pm
Posts: 8
Location: Chandler In
Thank you both , I feel better now knowing its fine :D


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 Post subject: Re: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 8:50 pm 
Utility Grade

Joined: Wed Nov 25, 2009 2:27 pm
Posts: 7
Where is the second piston ring? My 930 only has one that is pressed onto the piston itself. The older model years had a separate ring that is loose, which is why the manual states it's not on every model.

Just bought a 930 as my first gun, I got the #85325 combo from an online retailer with the 28" and 18" barrels. It seems to be well built and performed well the first time I took it to the range, hoping to hit some clays with it over the holidays. Quite a bargain for $474 including shipping.

I am curious as there are some plastic parts on the inside wrapped around the magazine tube. Are these able to be replaced with metal components?


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 Post subject: Re: Mossberg 930 gas piston question
PostPosted: Mon Nov 30, 2009 10:41 pm 
Tournament Grade

Joined: Sun Dec 09, 2007 2:32 pm
Posts: 293
Location: Tampa Fl.
All the 930's ( all SPX models ) I have seen use the one piece piston. There is a beveled shaped ring just in front of the rings that look like piston rings in a car. It is a seperate ring and rotates independent of the other rings. This must replace the other set up. My first post on this site was about this same issue. My gun is just over 2 years old and is an SPX model. I have found that this part needs to be kept clean. Carbon can build up under the rings which keeps the gas piston from moving freely in the sleeve on the barrel. Very easy to take the rings off the piston and clean under them. I thought I was cleaning the piston good but after about 4000 rds. the carbon build up caused some FTE with ammo I knew work in the gun. Another poster here turned me on to the trouble and now I always make sure I clean this area good. The pusher assembly is plastic but in over 6700 rds. has not caused any trouble. If I keep her clean, use good ammo, lube her lightly, she has done very well at our local shotgun matches.




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