Got my 940 today and comparing it to my 930 field with the or3gun kit in it. Hopefully my pics come through. The 940 is crazy similar to the Or3gun kit in 930 field model so I believe it should be a 2000 rd gun.I also have a pic of the standard gas system. It wont let me post pics yet so I have to downsize them. I will add them as soon as I get that done. The top one is standard 930 gas system. The middle is a 940 gas system. And the bottom is my Or3gun set up. The barrel band also has scallops in it and the forearm and retainer are different. Will have more pics soon. This post is not about cleaning your gun. This is about a comparison between an aftermarket gas system compared to the factory 940. For people who do not want to spend te money on te 940 there are options out there. Jerry Miculek has a video where he said the factory piston and spacer will work in a 930. So I will be trying that too. More than likely I will be making a video for you tube in the next couple months after I get a bunch of rounds through them both. For excellent cleaning videos look for te Jerry Miculek videos.
I do know my or3gun setup will got to 1500 rds before it needs to be cleaned so I am looking forward to the 940.

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I meant intervals between cleanings. A standard 930 needs to be cleaned every 500-600 red.

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I think you missed the point.

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It's my post you missed the point.
I will be putting this up against my 930 to see how long the 940 will go before it stops. I will
Be using my or3gun components in my 930 to make it fair. I already know the stock 930 is good to 700 red max depending on shells.

Ok here are my impressions. My 930 and my 940 are very similiar. Trigger groups are essentially te same although the 940 has plated parts in it. Magazine tube on the 940 is plated and has a 9 rd extension 930 is not plated. Both come with 3 chokes but te 940 has briley extended chokes 930 has standard tubes. 940 chokes are M\IC\C and te 930 has I\M\F. The receivers are different the 940 has a massive loading port and the 930 does not shell elevator is also different. On the 940 barrel the gas tube is different it has scallops in it. The gas pistons are also different te 930 has the 2 rings that sit on each other. The 940 piston is a 2 ring design only the outer one is now removeable. There are also scallops in it.. so my impressions is the 940 worth it YES.
To make my 930 run the way a 940 does here is what it cost
Or3gun duck hunting spacer tube and other parts $175
OR3GUN piston $40
Mossberg 930 $500
Extended choke tubes $100
$815 total and I do not have the plated mag tube and trigger.
I do not have the Mag extension
Or the oversize bolt handle.
My 940 was $900 with all the machining and every good you could want.
I am going to make a video about this because I cannot get the pics small enough with good resolution.

Interesting comparison. Thanks.

Thanks Pgeurts. I missed Field Grades original post so I'll have to guess on that one.

That is fantastic. I have been waiting for a side by side between a modded 930 and a 940. My money is on the 930 by the way. I am the owner of SBE Precision Products and therefore a bit biased as I am the one who designed and produce the stainless piston for the 930 sold by OR3gun. I have had people go over 2000 between cleanings of the gas system, but 1500 is very typical. It very much depends on the ammo. Some stuff is filthy, and other ammo is super clean.

Ok so I just got done with testing both guns I ran them until they turned into 1 shots. The 940 ran to 1700 rds and the 930 with the or3gun kit stopped at just over 1500. The ammo I used was whatever I could get mixed bag of steel and lead. I will try to get the pics of them before I cleaned them. I believe the 940 ran longer because of the plated mag tube which is smoother than the one in my field 930. I could tell the difference in cleaning it too. I also believe the Mossberg 940 piston scrapes the mag tube better with the inner ring in the piston. The or3gun piston does not have an inner scraper ring. The 940 also has larger forearm vents which my 930 has very small ones. So here are my conclusions A stock 930 is a great gun and I think it is the best one in the $500 class. But it is requires a lot of cleaning and is realistically 500 rd tops before cleaning. The OR3gun kit bumps up the reliability quite a bit and runs longer and considerably smoother. I believe the 940 system bumps that up even more. Those are my impressions now remember I own a 930 field which is my hunting gun so nothing is plated it is the standard model. If somebody has a JM Pro 930 the results might be different because it has the plated mag tube. Do I think the OR3GUN stuff is worth the money absolutely. I also think the 940 is a steal with all the features. I also like the stock 930 set up and ran it for a long time. So if you need want 940 performance out of your 930 you can do it with OR3GUN stuff. If you want to get into 3 gun just buy the 940 and be done with it you cannot modify a 930 for that price.. Now before you ask why I did not include the stock set up. It is because a stock 930 is a 500-600 rd gun and would not run with the other 2 gas systems. Sorry I did not have time to make a video work is crazy right now.

He wanted it to be about cleaning the gun, and I wanted it to be a comparison between the gas systems in my 2 guns.

I like your stuff I run the waterfowl kit in my 930.