870 dimple remover

[smokngun]

Does anyone have a tool or experience removing dimples in 870 mag tube?

[MP5_Rizzo]

There are a couple of ways to do it but the easiest way is to just drill them out.  The hole that is left will not interfere with any function and if you decide to operate in wet environment you have extra drain holes.

[Smith]

On 11/3/2017 at 8:33 AM, MP5_Rizzo said:

There are a couple of ways to do it but the easiest way is to just drill them out.  The hole that is left will not interfere with any function and if you decide to operate in wet environment you have extra drain holes.

I've done that and works fine. My current gun I actually used a Dremel and a sanding wheel and smoothed them down that way. Worked well and no holes. Here's another good way that's pretty easy. http://www.shotgunworld.com/bbs/viewtopic.php?t=53267

Quote

I posted this because I see almost every week in some forum someone asking about removing the dimples from 870 Express' magazine tube when they are installing magazine extensions. They have to be removed some way so the extension tube works. This is the way I prefer. Here is it step by step with pics.

To remove the dimples from an Express mag tube you need these: 
-hammer, 
-socket from you socket wrench set thats outside diameter is 7/8", 
-some lubricant (CLP or engine oil or anything),
-1/4" punch or bigger


Follow the instructions of your owners manual to remove the barrel and magazine spring:




Lubricate the inside of the tube where the dimples are:


Punch the socket with the hammer carefully into the tube. Note! Don't let it get too deep 'cause it's really hard to get it out of there. Punch it in and take it out a couple of times and you'll notice after every time it's moving easier. You might have to use pliers to get the socket out the first time.


When you have flattened the dimples as much as you can with the socket,
Leave the socket inside the tube right where the dimples are/were. Take the 1/4"punch and the hammer and tap the sharp edges of the dimples flat. 

At the end, take the mag follower and move it back and forward to see there really is nothing on its way.

I recommend to get the old style magazine spring retainer if you don't install extension but it's not necessary.

 

 

 

Edited November 8, 2017 by Smith

[Omega]

I've never dented mine but apparently it's a common issue that they make a tool for it, but it looks to be more expensive than a new tube.  Seen many references for using a socket driven through with a mallet to take it out enough to not have the shells bind up.

https://www.brownells.com/gunsmith-tools-supplies/shotgun-tools/straighteners-dent-raisers/magazine-tube-dent-raiser-prod25276.aspx

 

[Smith]

13 minutes ago, Omega said:

I've never dented mine but apparently it's a common issue that they make a tool for it, but it looks to be more expensive than a new tube.  Seen many references for using a socket driven through with a mallet to take it out enough to not have the shells bind up.

https://www.brownells.com/gunsmith-tools-supplies/shotgun-tools/straighteners-dent-raisers/magazine-tube-dent-raiser-prod25276.aspx

 

That's what my link refers to with DIY pictures.

[ken_mays]

Yes, the ones I've done have been done with a close-fitting socket.   It doesn't iron them out perfectly but a sanding wheel and polishing wheels on a rotary tool will take care of any high spots left.

 

I advise using oil or grease on the socket, and don't drive it in so far you can't get a grip on the socket to pull it back out (I use vise jaws).  
 

[smokngun]

Thanks fellas.  

[Omega]

1 hour ago, Smith said:

That's what my link refers to with DIY pictures.

I tried going to the link but SOCOM feels it's to dangerous for me to look at, so they blocked it. 

[smokngun]

Does anyone own a dent remover tool i could borrow

[Ronald_55]

What about something like a concrete anchor. The type you screw in and it expands the end. Some type of larger sleeve around it to fit the tube and equalize the pressure evenly. To reach deeper ones you just need a longer bolt or allthread to reach them.

Just a thought to toss out there to you guys.

 

[smokngun]

Did it a dremel and no holes.   Works like a dream.  

Edited November 5, 2017 by smokngun

[Spiffy]

Removing the dimples to use an extension on my 870 is the reason I first bought a dremel "gunsmithin" tool to start with.

[Smith]

I updated my post with the actual thread and pictures of how to do with with a socket. Easy as pie.