Mag spring help

Status
Not open for further replies.

NoobCannon

Member
Joined
Dec 15, 2010
Messages
283
Location
Wharton, Texas
I put a 2-shot shell extension on my H&R Pardner Pump, and it worked fine for awhile. I don't shoot the weapon as much as I should, so it just stays loaded in the corner of my room, in case I need it in an emergency. Recently, as I was putting a choke on it, I had to empty the magazine and remove the barrel so I could get a better grip on it to tighten the choke down, and I noticed the last shell didn't want to cycle out. Later last night, I decided to fiddle with the weapon some more, and put a sling mount on the front so I could put the old sling back on it until I could afford something nicer. This time, the shells wouldn't cycle at all. I had to remove the shells from the magazine by sticking my finger in the ejection port and grab the rim of the shell with my finger tip.

I inspected the mag tube, spring, and extension, and all seemed to be perfectly fine. No burrs or anything to speak of that would let the spring bind. I replaced the extension tube with the original locking nut, keeping the extended spring in there, and it cycled 5 shells just fine, just as good as the day I picked it up from the pawn shop.

This told me there was something wrong with the extension, that the spring was binding up on something, but the inside of the extension is perfectly smooth. Now, I sat and thought about it, and I realized there was a little 1-shot plug that sat on the end of the old spring, which I was an idiot for tossing onto my parts shelf, because when I went to go look for it, I discovered the cats have made off with it, thinking its a fun new toy.

Would that plug have anything to do with the magazine spring binding, or is it the spring itself that needs to be replaced? I bought the mag extension new at the beginning of the year, so it's maybe a few months old at most.

This shotgun is my range toy, but its set up for HD in a pinch, and I keep slugs for it handy in case feral hogs are spotted on the property. I have pistols for HD, and a Rifle on the way to take over hog-hunting duty, so having the weapon out of commission isn't a big deal, but it's got my curiosity as to why the spring is binding.

On the plus side, the locking nut has the original front swivel on it, so I got to put the sling back on.
 
When you installed the extension did you put in a longer/stiffer spring to compensate for the longer mag tube?
 
If the extension is only a few months old it's very unlikely the spring is weak unless it was simply defective from the get-go.

DON'T USE THE EXTENDED SPRING IN THE STANDARD MAGAZINE. It's WAY too strong and will compress the shells quickly.

What brand of extension is it? If it's a Remington factory unit, it may not be installed correctly.

Possible causes of these problems:

The shells may have expanded from spring pressure.
This is the real danger of leaving a shotgun magazine loaded long term. It isn't the spring weakens, it's the shells compress from the pressure and start to bulge between the shell head and the shot area.
If the shells do start to compress, either shoot them up or discard them.
For a defense gun, buy only higher grade American shells. These usually are more resistant to compression.

The inside of the magazine tube may be covered with a sticky coat of factory lube.
First thing to do when buying a gun, new or used is to clean it and apply fresh lube, including inside the magazine.

The spring may have been over-compressed.
If you try to force in too many shells the spring may get damaged.

Bad shells.
We're seeing a lot of shotgun problems these days caused by inexpensive shot shells. Some are over-sized.
 
I just checked it, and it's made by Advanced Technologies, Inc. Both the inside of the mag tube and the extension are clean and spotless. This is why it's a mystery to me as to why its binding.

I keep it loaded with Winchester PDX-1 Slug-and-shot, and I have zero non-american made shotgun shells in my entire collection. Everything is Remington, Winchester, or Federal. I compared the ones I keep in the magazine to some fresh out the box, and they don't seem to have any distortion to them. That being said, I'm leaving the shotgun unloaded tonight.
 
Did you buy the plastic one?
Sorry to tell you, but ATI accessories don't have a real good reputation.

Best I can tell you is to use some fine abrasive paper to lightly bevel the inside edge of the extension to remove any rolled edge that's catching the shells or spring.

Best advice is to get rid of it and buy a Choate extension.
 
UPDATE:

Its not the extension itself, it's the spring.

I stretched it back to the original length(as compared to the length of the magazine tube + the extension) reassembled it, loaded it up, cycled shells through, with the last one hanging up as usual, and I took it out and compared it to the length before the shells, and it was compressed a good 1-1 1/2" without any load on it. It seems to me that the spring isn't strong enough to hold 7 shells without losing its integrity. Should've been the first thing I checked for, but hindsight's 20/20.

So, I'm looking into some replacement springs from Wolff. Might get a few, just in case.
 
I've just recently been surprised by shotgun mag spring compression weakness. I have a Mossberg 590 and I kept it stored for about a year with 7 rounds in the 8-round tube just because I worried about spring compression. I noticed when emptying it recently that the last shell wouldn't cycle out and I had to bump the butt on the floor to eject it far enough to pull it out. The spring had gone weak. I called Mossberg and they sent me a new one free, but told me to store it for any length of time with no more than 3 shells in the mag. I've also picked up some Wolff springs too for other shotguns, but I don't think this is going to help anything in the long run.

Ed
 
Sounds like the best fix, 2 Wolff springs and take turns with them. Did the ATI Kit come with a follower, and is it the same length?
 
It didn't come with a follower, I recycled the original one. I plan on recycling it again when the new springs arrive. Nothing wrong with it, just a little stained and dirty.

The mag extension is actually very well made, it reminds me alot of glock magazines. Polymer casing surrounding a metal core(the threads and the serrated locking portion are metal). Fit and finish are good enough, but the magazine went soft on me. Nothing to do right now except play the waiting game for the parts.
 
2 Wolff springs and take turns with them.
Why take turns?

Springs don't rest!

If they did, we would all put our cars on blocks every night so the springs wouldn't wear out just setting there in the driveway.

If you don't exceed the yield point of the spring stock, it will last just as long compressed as not compressed.

rc
 
While not supposed to, in the real world some springs, probably the majority, do take a set if left compressed for a long period of time. Rotating the springs will avoid this.
 
I know new springs take a set.

But if they are not over-compressed beyond the yield strength in the first place, they don't "set" any further after the initial set has occurred.
And they for sure do not "rest" or regain any strength when you take them out of the gun for a while!.

Using them, by loading & unloading, and recoil bouncing the shell stack against them every shot is what wears out a shotgun mag spring.

rc
 
We are assuming here, that we're talking about a spring that was made from quality steel and not recycled tuna cans and was properly tempered. Shotgun magazine springs will fail if left fully compressed in a magazine for a long time. "Stretching" a spring will kill the temper in it. Don't "stretch" it, replace it. If you want to store a shotgun loaded for the long term download it by at least one round.
 
[quote="Drail]If you want to store a shotgun loaded for the long term download it by at least one round.
[/quote]
That's exactly what I did as mentioned in my post above. I kept 7 rounds in an 8-round Mossberg 590 magazine and it compressed anyway in a year's time.

Mossberg told me to leave it stored with no more than 3 rounds in the 8-round tube to avoid compressing the spring.

Ed
 
Status
Not open for further replies.
Back
Top