Sudden slack in 590 mag spring?

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Dope

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Hey guys,

Here's the deal.

About 6-8 months ago I bought a Mossberg 590 (20", 8+1 capacity). It is purely for home defense. It is stored in a vertical holder of sorts near my bed (except for when I leave the house of course, it goes in the safe).

I read up on the subject and decided to leave it cruiser ready. 8 rounds in the tube, chamber empty, hammer down. I was mildly concerned about the mag tube spring but after reading 8000 posts on this board I felt confident it wouldn't be an issue.

Well, recently I decided to unload it, clean off the dust, re-lube and throw some new rounds in the tube to prevent them from bulging (none were, btw). However, I noticed something.

When I first loaded the shotgun right after I bought it, the 8th round in the tube was pretty tough to get in. Then when I did it again recently, it was MUCH easier. Every round cycled properly when clearing the shotgun, put putting the new rounds in the tube was 100x easier. The spring felt dramatically weaker.

I talked to Mossberg and they said not to leave the shotgun loaded, as the spring will wear out. Which seems to be true, from my experience.

So which is it? I know enough about springs (big car enthusiast) to know that they should not wear out from being stored like that. Unless perhaps by loading 8 rounds I was over compressing the spring? Should I perhaps only load 7 for storage? Or perhaps the spring is just some cheap piece of crap that's not even heat treated properly (which appears likely)? Should I just get a Wolff spring and call it done? I'm worried that the shotgun is going to stop cycling properly if I keep it stored like this.

Dope
 
Stop worrying. Breath in, breath out! :D

Look, your spring is just settling in, and you don't have to worry about keeping it loaded being a cause of the spring wearing over time. Constent compression and depressions will cause this to happen.

I'd leave 7 in it for binding concerns but not wear concerns. Get a side saddle for more rounds if it'll make you feel better.

You really can't wear out these springs today. Mossberg doesn't make it easy to see the spring as the magazine tube doesn't come off.

It's a pump, so you have much more reliablity then a semi. Over time, try it out occasionally to see if you're ok, but I'd not fret.
 
I've found that in my 590, keeping it loaded with 7 or 8 rounds in the mag (for several years, plus cycling rounds through a few times a month) has no effect on the function of the shotgun. The last round barely plurps out when I unload manually (via the loading port) and made me think similarly to you, but when actually cycling the gun the last round never fails to do what it's supposed to do.

YMMV
 
Get a Wolff spring it will last a very long time with the mag tube fully loaded.

The Wolff 12Ga universal spring cut to around 29" and bend the ends down to the lower coil so they don't stick up. keep the coil the same diameter as the lower one. The springs Mossberg were using was low quality. Mossberg knows it that's why they are using higher quality springs in their 590 shotguns. They just started using better springs this year.


GC
 
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I have seven pumps stored with full mags, four of them Mossbergs, three 500s and one 590.

One of the the 500s has been like that for 20+ years, and I've had no feed problems with any of them.

I'm guessing this isn't something to be concerned about.

Les
 
Thanks for the advice guys. Think I'll just keep an eye on it. Like I said, it cycled just fine. If I can't sleep, I'll buy a new Wolff spring :p

Dope
 
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