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View Full Version : 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/photo/f5R-f78g1OfExxQqJQ91jpM0sNX8HLAeqjQGR428HUY?feat=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/firearms/shotguns/model-870/model-870-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/Extension-Tube-2-Shot-12-Gauge/productinfo/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/ccp0-prodshow/tankhdclamp.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=12519/Product/REMINGTON_SLING_MOUNT

http://www.brownells.com/.aspx/pid=1581/Product/SHOTGUN_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.