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Author Topic: Anyone Ever Install an 870 Mag Tube Extender?  (Read 12112 times)

crusader rabbit

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Anyone Ever Install an 870 Mag Tube Extender?
« on: October 17, 2013, 07:42:10 AM »
I've recently been given a Remington 870 in a pretty standard configuration and I'm thinking about making it into something more SD oriented.

To wit:  I think I'd like to go from the 5 shot mag tube to either a 7 or an 8 shot tube.

They seem to be readily available from Sportsman's Guide and Midway.  I still won't buy from Cheaper than Dirt.

Anybody here ever do this modification?

Are there problems to watch out for?

Do the extensions come with longer springs?

Do the extensions negatively impact feeding?

What should I look out for?

It seems like an inexpensive modification that could show some real benefit when the zombies attack.

Thanks in advance,

Crusader Rabbit
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Majer

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #1 on: October 17, 2013, 10:35:36 AM »
On some of the later 870's they had "dimples" in the end of the mag tube to keep from adding an extended tube.You can either drill them out or use a small sanding drum on a dremel tool to remove them and the new tube will work fine.All the aftermarket tubes I've seen have the spring with them.
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TAB

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #2 on: October 17, 2013, 01:59:24 PM »
not heard about the dimples, but i have heard about some guns needed to have the end of the old mag touched up  so that stuff ran smooth.    it is going to change the balance of the gun.   you will have an extra half pound plus out there.
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Solus

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #3 on: October 17, 2013, 02:56:06 PM »
The end cap of the mag tube is removed for through cleaning and the extension just replace that end cap with a threaded tube and longer spring.

If you have no dimples, it is a very quick job.   What the dimples do is prevent the mag. follower from moving past them.

I drilled mine out on the second 870 I added an extension to (the first did not have them) and still  needed some burr cleanup in the tube.

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kmitch200

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #4 on: October 17, 2013, 03:18:43 PM »
Quote from: crusader rabbit on October 17, 2013, 07:42:10 AM
To wit:  I think I'd like to go from the 5 shot mag tube to either a 7 or an 8 shot tube.
If I bought another one, I would buy the 2 or 3 shot like you are thinking. I got the 4 and it put a lot of weight out front.
Got mine from Brownell's. (Choate)

Quote
Do the extensions come with longer springs?
Yes. Mine also came with another follower and a barrel/mag clamp on front sling swivel.

Quote
Do the extensions negatively impact feeding?

No. 
I read about the dimples in the 11-87 mag tube, (my 870 didn't have them), and tried it on that gun just to see what would happen.
It was a no-go 'cause the extra rds can't get past them. If your 870 is an express, it might have the dimples.

And you were given a shotgun?  We hate you.  :D
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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #5 on: Today at 12:02:24 PM »
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Big Frank

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #5 on: October 17, 2013, 03:21:01 PM »
Just like Solus said, I added a Choate tube to my 1100 that also fits 870s. Very easy since my older model didn't have dimples in the tube. It didn't seem to have any negative impact except a little more weight that really isn't THAT bad.

P.S. You can get mag extensions made out of aluminum instead of steel.
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kmitch200

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #6 on: October 17, 2013, 03:29:41 PM »
Quote from: Solus on October 17, 2013, 02:56:06 PM
What the dimples do is prevent the mag. follower from moving past them.

They keep the newer style mag spring retainer in place.
The old one is a circular piece of spring steel. The newer ones are plastic with slots to go past the dimples then turn 90deg to retain in place.
It does make getting out the follower a bigger PITA but the follower needs to be full diameter so it has slots too. 
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crusader rabbit

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #7 on: October 17, 2013, 06:22:36 PM »
What a wealth of information.  Thank you all.

Crusader
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Dakotaranger

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #8 on: October 17, 2013, 11:35:38 PM »
Yeah, I had to have the dimples of my 870 removed.  And I'm not sure they did that great of a job because it has caught a time or two.   There is this option.  http://www.blackacestactical.com/#!product-list/c1srd
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TAB

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Re: Anyone Ever Install an 870 Mag Tube Extender?
« Reply #9 on: October 18, 2013, 12:01:18 AM »
i would thing drilling them out then taking a debur knife to both the in and out side, would work great, if the right size drill was used.  A dowl with emerypaper might also be useful( remember to add some bluing to prevent rust what ever you do)
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