About Mag Extensions...

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Dave McCracken

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I was asked by PM how crucial an extension was on a "Serious" shotgun. Here's some background and some thoughts.

My oldest 870 had one in the early 80s. It's the two shot model, probably a Remington.

The 870 used for deer got one around 1990, when my oldest was semi retired to strictly HD duty.

This one had a 20" barrel, so it got a 3 shot version, probably a Choate. I may have mixed them up, it's been a while.

In all this time, no probs. Call it 3-5K shells between them.

I've seen and fired the ubiquitous 1100s with extensions that give 10+1. These are impressive in rapid fire,but it takes considerable arm to operate them effectively. And as the shells are fed, the balance shifts rearward. It does on all repeaters, but it's accentuated on something that long and hi cap. After all, 10 12 gauge buck loads weigh about 2 lbs.

Besides the more beans in the wheel, the mag extensions have some serendiptious benefits for the shotgunner.

First, the extra weight cuts felt recoil by reducing free recoil.

Second, the weight reduces barrel rise, thus taking less time to reacquire the sight pic and get the next shot off.

Third, the weight helps the swing. This is vital for moving targets, from woodcock to perps.

Fourth,clamping the barrel and extension together make the vibrations at launch more consistent. This reduces slug groups, sometimes dramatically.

Downside, the extra weight may be a bit too much for some shotgunners, especially kids and pixies.

Is an extension essential?

Nope. It's nice to have, but plenty of good work has been done with stock repeaters right from the box.

And realistically, if 4 rounds of buck do not reduce the threat level to acceptable in an A/S scenario, 6, 7 or 10 are unlikely to either. We like hi cap, but most crises that are settled with a shotgun run one round, one perp.

Of course, there's exceptions.

Erick may correct me,but I believe Gunsite shotguns have no extensions. Neither do most agency weapons. A good shotgunner and a stock shotgun are absolutely deadly when used within the limits of the weapon.Good shotgunners also tend to be good at loading fast. Shoot one, load one, is a great idea for "Serious" sctivity.

Some experiments with Frankenstein and weights attached to the magazine cap lead me to believe that a two shot extension is close to optimum for most people. More gets heavy quickly. This is, IMO, the best compromise between capacity and handling ease.

So,should YOU add an extension to your shotgun?

Maybe.More ammo is better within limits. I wouldn't do it on an all around shotgun.

I wouldn't put one on a shotgun to be used by kids,geezers, beginners or our smallest shooters.

I would put one, probably a two shot, on a new "Serious" shotgun, or a slug shooter. And I'd practice fast loads as well as exercises.

What do you think?
 
Dave,
I went with the one round extension from WC for my HD 870. If the need ever did arise, the extra round would be nice but it shouldn't change the handling very much if at all. I'll take it to the range tomorrow and see how it feels.
 
I like the +3 for mine, but they're all 20"ers as well. I rarely load to the max so the extra weight does not come into play for me either. It is just nice to have the room should I need to pack 'er up and haul my keister somewhere.
I also use the factory extension and clamps with the sling swivel. This way I can pop a sling on when I feel the need.
The range where I shoot clays is a State Park deal so I can only load two at a time but the sidesaddle is always full! Makes for some interesting (mostly friendly) comments! It also gives me a bunch of reloading practice.
Mike
 
I don't currently own an extension or plan on buying one, but I think your comments are on target Dave.
 
Thanks, guys....

Riverdog, get back to us about that one shot extension and handling. Feel is subjective, but I think you're advanced enough to judge and give an informed opinion.

Mike, these here are sling ready. The TB's the only 870 out of 5 not outfitted with studs. The two "Serious" 870s kept Cruiser Ready are loaded one round under capacity.

Thanks, H.
 
My criteria involves the length of time I can hold the shotgun with one hand. If I can keep it shouldered (and well enough to deliver an accurate shot) with just my strong hand long enough to have a conversation with a 911 dispatcher, its good to go. The extension may or may not prohibit this depending on the gun and how many times/week I've been lifting weights ;)
 
Dan, a good idea in theory, but last time I had to call 911 I was put on hold for maybe 2 minutes.
DC, of course...

In this situation, I'd tuck the butt into my armpit just a bit. Still covering what's needed to be covered.
 
While I do have a Mossy 590, I have never added an extension to any of my other shotguns. I don't ever plan to rely on a SG for serious social work. I prefer an AK or AR type rifle for anything even remotly resembling that. ( I am even comfortable with my old Stevens 16 Dbl with #1 Buck for house duties.)

If I were to buy another SG that had one installed, that would be ok, but I have no plans to buy or install one on any of my existing SG.
 
The Mossy came with the seven shot tube, thus eliminating the need for an extension.

Truth of the matter, I didn't feel the need for an extension at age 19 using the 20ga Mossy with four shot tube, so I don't see the "need" for them now. If you got one fine, if not fine. Like Dave said, if 4-5 rounds won't solve 8-9 probably won't either.
 
Weight matters. My fave thing (well, I have a lot of fave things) at skul is to see the bankers, goateed IT geeks, insurance salesmen and physicians all hold their gamey mag extended shotguns on target for just a few minutes!:D That and the reduced reliability that these things give.

Whatever weapon you want to fight with, exercise with it. You don't have to spend all day on the weight pile but just 15 minutes a day will do wonders. Work it into your gun handling/dry practice.
 
Dave- Yikes! I suppose I'm a little inexperienced in the 911 call department (Thank God!). Thanks for the tip.
 
The one-round extension I have came from Wilson Combat and has a QD sling attachment. $45- It doesn't make the shotgun feel significantly different than the factory configuration when empty. I haven't had a chance to fill it up yet to see how it feels w/5+1.
 
The thing about extensions is that you can put them on and take them off. I have extensions that give me 7/8/10/12 rounds total in my Remington shotguns. Some of my SG's wear a factory extension permanently like my 11-87 Police or my fectory folding stock 870 riot. Some can't be taken off like the extension on My Benelli M3S90. My 20 year old 1100 is my everything SG and is configured with different barrels and extensions as needed for whatever I am shooting. I shoot skeet, hunt, shoot 3 gun matches and combat type SG matches with it. Yes, the 12 round extension can make it heavy when loaded but I am a big guy and can weild it without any problems.

In the pic below is my 11-87P with a factory +2, a Benelli M3S90 (pump auto) that has a permanent 7 round mag like the mossbergs and my 1100 witht he long barrel and +2 mag extension. I will post a pic of the same 1100 witht he same barrel but with the 12 rnd extension on it.
 
12 rounds? Holy Tendonitis, Batman!

El Tejon,please tell us about reduced reliability from mag extensions. Thanks...
 
I am also interested in the reduced reliablility. As far as I can tell, they are essentially just longer magazine caps.
In fact, I would consider them a boon to reliability since they are (on my 870's) secured with a clamp so they can not unscrew while afield.
Please enlighten me.
Mike
 
Most of the SG shooting I do it with SG's that have extensions and I have never had any reliability problems related to mag extensions.
 
I have had reduced reliability because of a magazine extension. I am new to shotguns and it took me a looooong time to figure out why the gun was not reliably pulling shells from the mag tube.

Basically, I think the seam where the mag extension meets the mag tube is not seamless. The follower gets hung up there and the shells to not get pushed into the receiver. I am on my third different follower design (not including the one I got with the gun) . . .

Here is a thread I started on the following line regarding this and other problems that I have had with this shotgun.

http://www.thefiringline.com/forums/showthread.php?threadid=124088&highlight=870

Joe Mamma
 
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Joe,
Thanks for the link back to the TFL thread. I have had no problems with my WC/ST follower, but I haven't really stressed it yet. Having only a one round extension, I probably won't have the seam hang-up issue that seems to be a possible concern with the longer extensions. However, the point to the stailess follower inBrownells is very good to have in the back of my mind.
 
riverdog, I have tried the Brownell's stainless follower. It was actually worse than the Wilson Combat/ Scattergun Technologies one. The stainless one has very sharp edges so it hangs up at the mag tube/mag extension seam easier.

I am now using a plain steel follower which was made by Choate. I do not believe this same style is being made any longer. It basically looks like a big thimble. This is the best one so far but, I am still having some problems with this gun. The next time I have it apart, I am going to polish/ round the edge of the mag tube so the follower won't get hung up there. I am also going to polish the outside of the follower for the same reason.

Everytime I hear someone recommend a Remington 870, I just shake my head. I cannot belive what a piece of **** I own. It has been a year and a half since that TFL post and I am still working on this thing.

Joe Mamma
 
I'd've sent it back to ST. From what I hear, they are usually very diligent about fixing their guns that come back with obvious QC problem. Give them a call and see what they say.
 
Most of the extensions,mayhap all, have a collar that screws into the threads on the mag tube and then the extension itself screws into this, correct?

Make sure it's all tightened up. If there's a gap between the one part and t'other, it may cause the follower to catch, like the example here.
 
On my stock extensions, I screw down the collar as if it is a normal mag cap, one click past tight. Actually the extension is already screwed loosely into the cap but you get the idea. Then I screw in the extension (through the collar) until it bottoms on the magazine, careful not to over tighten and tweak the threads or the extension lip. The factory clamp holds it in place and I've never had a problem. I clean my 870's after every shoot so my extensions are removed and replaced often.
I have a couple of the Brownell's SS followers and one Wislon lime green job and they all work OK.
Mike
 
I did see some "reliability problems" when first sticking a Choate extension on one of my 870 Express - that damnable dimple thing.

Walking the shells through/just chucking showed they hung up initially. Judicious use of some "deburring stuff" solved the problem.

But I'd agree that a 5-round SG is very serious business indeed.

Coupla extra rounds never hurt for a HD-thing though.

All told, make sure yours feeds whenever sticking anything extra on.
 
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