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Mossberg 930 Autoloader Mag Tube Assemblies and Extensions

I see this thread seems to have gone dead... Any chance anyone is still around that can tell me which +2 I should go with? Reading through the posts it seems that some manufacturers have become unreliable. Anyone recently do anything to a 930? So far I've added a shell carrier with rail and a pistol grip stop with limbsaver/cheekriser from mess tactical. Was thinking about a front rail as well to add either an angled or just a forward grip.
 
Choate is fine, and if you really want to "be sure", spend another $9 for this:
https://www.autozone.com/test-scan-...djustable-disc-brake-cylinder-hone/531780_0_0
and spend a couple of minutes, back and forth, down the tube, after dribbling some light oil inside, for lube. It also doesn't hurt to spend a bit of time lapping the edge, where the threads stop at the beginning of the tube body. A light chamfer at that point stops spring/follower hang ups. I also sanded the edges of the polymer plug so that it dropped in/out freely.

It depends on what you want and what your uses are. Choate has tended to be a bit rougher in finish, from the factory, but it is steel, and with 10 minutes of work is as smooth as the higher priced, thinner-walled, aluminum body, tubes.

I've noticed smoother feeding after honing my extension and mag tube, and dropping HFD2's follower in:
https://www.hfd2.com/defender

I've typically used Vang's stainless followers, but decided to give these a try. Smoother loading and consistent feeding. YMMV.

You can bolt on a section pf MagPul poly rail to your forearm, just be sure to check that the domed bolt heads don't interfere with the piston movement.
 
Thanks, maybe I'm daft, but I cannot seem to find any extensions sold for the 930 other than the GG&G website. Is there a website or websites someone can direct me toward? Thanks for the reply but!
 
I have the Tacstar +5 on my built Remmy 11-87 SP and the Nordic +5 that came on the 930 JM Pro. both guns are 9+1. The Remmy has a 25.5" barrel and the JM a 24" barrel. I like the Tacstar far better!! ... one piece in carbon fiber ... no messing around with tube, nut and cap as with the Nordic. Super sturdy too!!

https://imgur.com/lgog2li
https://imgur.com/O2I2AID
https://imgur.com/dLQke3i

https://imgur.com/1QxLrDz
https://imgur.com/EAlrMyl
lgog2li

O2I2AID

dLQke3i


1QxLrDz

EAlrMyl
 

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I had the problem of shells hanging up in the magazine tube of my 930 SPX. I was able to fix the problem following some of the suggestions in this thread. I just wanted to put what worked for me out here.

The reason for the hang ups has already been mentioned earlier in the thread. The factory Choate extension doesn't fit snugly in the magazine tube. Either the follower or a shell base gets stuck in the transition between the extension and the tube. Here is what I did to fix that:

Start by changing the follower. The factory follower has sharp edges, which makes it more likely to get stuck. I went for the GG&G Mossberg 930 Follower. There has been suggestions of using a Wolff spring (part #17905) in the forum. I tried that too. I ended up trimming about 1.5 inches from the said Wolff spring to make it fit. In my case, it did not help with the hang up problem. I went back to the factory spring.

Next, I sanded down the teeth on the Choate extension with 320 grit sand paper. Put the sand paper on a smooth surface. Press the Choate extension on the sandpaper firmly, and pull in one smooth motion. Lift, go back, and repeat. Rotate the extension slightly (to prevent uneven sanding) before each pull. It took me maybe 10-15 minutes to sand down the teeth. After this step, the Choate extension could screw in half a turn more into the magazine tube. I could still fit all 7 shells in the tube.

Last, I put a 30 degree chamfer inside the magazine tube end. If you haven't done machining on a firearm before, it is probably best to have a professional gunsmith do this. The chamfering bit I used is a Yonico 13905q (30 Degree with 1/4" Shank). You can find it from various vendors online. Stick some tissue inside the tube to prevent metal scrap from getting in. Place the magazine tube on a block so that it is level with the chamfering bit. Generously lubricate the end of the tube and the chamfering bit. Seat the chamfering bit in the tube. Hint: If the bit has seated properly in the tube, it doesn't wobble while turning. If it keeps wobbling, adjust the angle so it seats properly. Otherwise you'll have uneven chamfer. The magazine tube has thin walls, and I realized very quickly that the bit could chew it up. So I had the bit rotate in the wrong direction (i.e. rubbing against the tube instead of cutting into it) at moderate speed.

After all this, I tried loading & unloading the firearm many times, and put around 100 rounds at the range. No more hang ups in the magazine tube. Hope this helps people with a similar problem.
 

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I'm having a problem of double feeds right now. I bought the GG&G +2 for my 930 tactical. I think the spring it came with is much too long. Anyone have any experience with this and knowing how much of this spring in going to need to cut?
 
So, anybody still reading this thread? I’m wondering what length to cut my Wolff spring to? I was thinking start at 30”. I think some people have been running 24-25”.
 
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