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Upgrading the Mossberg 500

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1.8K views 8 replies 5 participants last post by  ghost tracker  
#1 ·
So I did an experiment here recently. I wanted to see if the heavy wall 18.5" barrel and the magazine tube with S&J +2 extension from off my 590a1 would fit my Mossberg 500. They mated up perfectly. So I have sold my 500 ghost ring barrel and 5 shot tube and spring on eBay. I've since purchased a Mossberg 835 five shot magazine tube part number 12113p and the Mossberg 835 spring # 12194. I also ordered an s&j hardware mag extension. The mag tube came in as did the spring. I test fitted them when the +2 extension arrived from Canada. I initially tried the s&j follower and spring an was only able to get 6 in the magazine tube. I thought I'd try the 5 round Mossberg 500 spring. Then it hit me and I compared the 835 spring to the 500 spring and it was longer than the 500 but not as long as the s&j spring. So I assembled it all and was able to load 7 rounds of estate and sellier and bellot in the tube no issues. I tested several various brand rounds they all seemed to cycle fine and the s&j delrin follower and the 835 spring load smooth as butter!

I've also purchased the longer slide action assembly and nut and will be putting a magpul moe forend on it.
For those curious I did use my law enforcement discount to get these parts at a discounted rate. Long action tube assembly part # is 11603bl and the tube nut is 3408.

I'm just waiting for my 18.5" accuchoke heavy wall barrel to get here and then I'll install it.


I wanted this setup like my 590a1.

I'm gonna be keeping the Mesa tactical stuff and putting it on a maverick 88 project in the future.

I plan on having the Accu choke barrel magnaported like my 590a1 and the forcing cone lengthened, polished, and the barrel back bored by Aimpro tactical like I did on my 590a1. I'll be running an improved cylinder choke on it like my 590a1.

I do plan on purchasing the aluminum trigger group for this one.

Who else has an 8 shot Mossberg 500 with 18.5" barrel? Please chime in if you do.

I'll be running a magpul sga stock on this one like on the 590a1.



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#2 ·
Looks nifty. I have been wanting to do a HD and have a mossy 500 20 GA. After thinking and contemplating, for what I want, all I am going to do is add the 18.5 inch barrel and call it good. The barrel runs about 100 bucks and is a worthwhile upgrade for my basic needs.

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#3 ·
I just added the Opsol adapter and loaded my 500 with 8 Aguila Mini shells. Each shell throws 7 #4 and 4 #1 buckshot pellets at 1250 FPS. Plus I can now carry 8 instead of only 4 more shells on the side saddle.

Works for me.
 
#8 ·
Mossberg sent me the accuchoke barrel finally for my Mossberg 590a1. What they neglected to tell me before I ordered it was that they'd changed things mid production on the 50774 model. They no longer came with the five shot mag tube and thus the S&J hardware extension does not work now. So now I have a 90.00 paperweight for a mag extension.

So Mossberg is supposedly sending me a 6 round magazine tube for this. It'll look like the pic below and I'll no longer be able to have an 8 shot 18.5" barrel. This irritates the hell out of me. It does not look aesthetically pleasing as the mag tube won't be flush with the barrel. I guess when I get it I'll measure and see how much room I have and see if I can find a +1 extension to the exact dimensions needed. If not I may see if a gunsmith can work something up and cut down a 2 round extension and make it work.

Of course my 500 will have a magpul sga stock and magpul moe forend.


This whole experience has soured me on Mossberg. They just kept screwing up and serving me the wrong parts. Then I wait 4 weeks for a damn barrel that's totally different than what I wanted or requested.

I'll not be buying anymore Mossberg products due to their incompetence and stupidity. I plan to discourage as many people as I can from buying Mossberg products.


I guess I'll be selling my Mesa tactical stuff and not be building a maverick 88 after all as I cannot build it the way I want it.
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