how to add extension tube on 870p

mkmr · April 20, 2011, 09:46 PM

I am trying to add a 2 round extension tube on my 870p, and this is what I have after remove the Magazine Cap Sling Swivel on the mag tube.

Anyone knows how to take out this thing without damage it.

Many thanks

https://picasaweb.google.com/lh/phot...eat=directlink

T. O'Heir · April 20, 2011, 10:31 PM

Hi. That's just the mag spring retainer. Go here and look at the manual. Page 11 about putting in the mag plug. There may be a couple of 'dimples' that will have to come out too. Wee drill.
http://www.remington.com/products/fi...0-express.aspx

mkmr · April 20, 2011, 11:20 PM

thanks T. O'Heir, I got the retainer out.
One more question, the wilson combat 2 round extension tube I got does not have a sling mount, do you know any sling mount that will fit it.
the extension tube I got is this one

http://shopwilsoncombat.com/Extensio...info/SGET-U-2/

thanks

TheKlawMan · April 21, 2011, 01:17 AM

If you have an 870P it won't have the dimples and I believe the spring retained in your photo is the type used on a P style 870. The dimples are found on most of the 870 Express mag tubes. The 870 magazine tubes with dimples have a different kind of spring retainer that engages the dimples of the mag tube. If you add a mag extensioin you won't be using the spring retainer. Some info on mag extensions is found on the AI&P Tactical site. http://www.aiptactical.com/How-To_Videos.html

Dfariswheel · April 21, 2011, 06:13 PM

An excellent sling mount and barrel clamp is a close copy of the excellent Remington factory clamp sold by Tank's Rifle Shop.
This clamp was actually made by Uncle Mike's but they no longer catalog it.

You want a clamp because if you drop of give the gun a good bump, the extension can break off the gun. That ruins the gun's magazine threads, and that's a trip back to Remington for a replacement.

http://www.tanksrifleshop.com/trs/cc...nkhdclamp.html

For just a swivel, you can install a plate between the extension and the barrel support.
These are available with the sling mount on the right or left side, or the bottom:

http://www.brownells.com/.aspx/pid=1...ON_SLING_MOUNT

http://www.brownells.com/.aspx/pid=1...N_SLING_PLATES

mkmr · April 21, 2011, 08:55 PM

thank you guys.

have a great weekend!!!

IowaYoungGun · April 21, 2011, 10:32 PM

Well the other fellas beat me to helping out! You should post the pic of the final product.

TheKlawMan · April 21, 2011, 11:18 PM

Dfariswheel. I oftened wondered about the wisdom of mag extensions without barrel clamps. I usually don't use my Remington 2+ because removing and reinstalling the barrel clamp is a pain and I swap barrels several times a week for either going to the range or shooting drills, while I keep my only shotgun set up the rest of the time for HD with the short barrel. It's nice to know that clamp serves a purpose even if I don't attach a sling to it. Also, I had thought of just mounting the extension without the clamp and now I know better.

April 20, 2011, 10:31 PM	#2
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	Hi. That's just the mag spring retainer. Go here and look at the manual. Page 11 about putting in the mag plug. There may be a couple of 'dimples' that will have to come out too. Wee drill. http://www.remington.com/products/fi...0-express.aspx __________________ Spelling and grammar count!

April 20, 2011, 11:20 PM	#3
mkmr Junior Member Join Date: April 20, 2011 Posts: 3	thanks T. O'Heir, I got the retainer out. One more question, the wilson combat 2 round extension tube I got does not have a sling mount, do you know any sling mount that will fit it. the extension tube I got is this one http://shopwilsoncombat.com/Extensio...info/SGET-U-2/ thanks

April 21, 2011, 01:17 AM	#4
TheKlawMan Junior member Join Date: June 23, 2009 Location: Orange County, CA Posts: 2,149	If you have an 870P it won't have the dimples and I believe the spring retained in your photo is the type used on a P style 870. The dimples are found on most of the 870 Express mag tubes. The 870 magazine tubes with dimples have a different kind of spring retainer that engages the dimples of the mag tube. If you add a mag extensioin you won't be using the spring retainer. Some info on mag extensions is found on the AI&P Tactical site. http://www.aiptactical.com/How-To_Videos.html

April 21, 2011, 06:13 PM	#5
Dfariswheel Senior Member Join Date: May 4, 2001 Posts: 7,478	An excellent sling mount and barrel clamp is a close copy of the excellent Remington factory clamp sold by Tank's Rifle Shop. This clamp was actually made by Uncle Mike's but they no longer catalog it. You want a clamp because if you drop of give the gun a good bump, the extension can break off the gun. That ruins the gun's magazine threads, and that's a trip back to Remington for a replacement. http://www.tanksrifleshop.com/trs/cc...nkhdclamp.html For just a swivel, you can install a plate between the extension and the barrel support. These are available with the sling mount on the right or left side, or the bottom: http://www.brownells.com/.aspx/pid=1...ON_SLING_MOUNT http://www.brownells.com/.aspx/pid=1...N_SLING_PLATES

April 21, 2011, 08:55 PM	#6
mkmr Junior Member Join Date: April 20, 2011 Posts: 3	thank you guys. have a great weekend!!!

April 21, 2011, 10:32 PM	#7
IowaYoungGun Member Join Date: April 7, 2011 Location: Iowa Posts: 31	Well the other fellas beat me to helping out! You should post the pic of the final product.

April 21, 2011, 11:18 PM	#8
TheKlawMan Junior member Join Date: June 23, 2009 Location: Orange County, CA Posts: 2,149	Dfariswheel. I oftened wondered about the wisdom of mag extensions without barrel clamps. I usually don't use my Remington 2+ because removing and reinstalling the barrel clamp is a pain and I swap barrels several times a week for either going to the range or shooting drills, while I keep my only shotgun set up the rest of the time for HD with the short barrel. It's nice to know that clamp serves a purpose even if I don't attach a sling to it. Also, I had thought of just mounting the extension without the clamp and now I know better.