Greetings everybody from Texas!  I purchased a SR556E about a month ago.  I just finished installing on top a 3-9X32 Compact CQB Scope and like it very much.  I went on Ruger's website because I am wanting to purchase a Bipod but I am unsure what I need to purchase since there is nothing to mate to below the weapon.  I am also wanting to something to cover the butt "forgive my terminology" I am very new at this.  I really would appreciate anybody's help/experience with this.  I have only shot probably around 25 rounds so far with it.
Thanks for your input, Will post pics when I get it set up and figure out how to on this forum.

Hi there. Welcome to SR-556 land!

Your E came with some screws and rail plates you can mount on the grip. Just screw one onto the forward lower position and then you can mount any picatinny bipod you like.

There are adapters to mount sling swivel bipods, but I've never set one up like that. They seem a bit cheesy to me.
http://www.amazon.com/UTAC-Swivel-Picatinny-Adapter-Anodized/dp/B00AUB3TES


I use a GG&G Standard XDS bipod on mine, but there are many that will work.

http://www.gggaz.com/standard-xds-swivel-bipod.html

I replaced my stock with a Magpul stock. They have a rubber butt plate and you can get them in different thicknesses if you like.
There are a billion difference stock options. The Ruger uses a milspec buffer tube, so make sure you get the right kind.

Thanks Andr0id, I appreciate your help!