how to add extension tube on 870p

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
 
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
 
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.
 
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