I'm looking for something like
this but I don't care for the bottle opener. It may sound nit-picky but there's got to be something like this out there.
Ultimately what I want is a little rectangular front sling mount with a hole big enough to run an HK style clip through. No rectangular loops, no swivels, I'm planning on building my own sling. 1" webbing to HK clip, to rail mount. That simple.
I've seen the magpuls, but I really like that blockier look. It's so simple, I can't believe that nobody has made one without gumming it up with a bottle opener. Picky SOB I am.
Also, this is probably in the wrong section, sorry about that.
Order the one from Brownells and mod it with a dremel tool.

I thought about it but I'd have to reanodize to keep myself sane.
Not ideal, but if there's a d-ring attachment for it that would work.
http://www.gggaz.com/quick-clip-sling-thing-for-dovetails.html
How about this GG&G rail mount for HK style quick clips or snap hooks.
http://www.vikingtactics.com/slingacc_lusa.html
Or an overkill solution (without a bottle opener) would be the Viking Tactics VTAC universal sling attachment, you can use a quick detach sling swivel, a conventional sling swivel, a hook, or simply run the sling through the sling loop.
Here's another:
Ours uses an aluminum base with a properly sized hardened steel insert for interfacing with H&K snap hooks.
Keep in mind that steel H&K snap hooks will eat up all aluminum mounts in short order. Also keep in mind that if
the post isn't sized correctly, it is quite easy to have your sling disconnect accidentally.
Here's a
demo video from Military Morons showing just how easy it is to accidentally disconnect from an
improperly sized hole.

THIS is what I use . And I love it .