I bought a AR 15 Sport (not Sport II) years ago. I haven't shot it much. I mainly shoot handguns or .22lr rifles to include a AR 15-22 which I like a lot. The Sport has the old M16 front sight with gas block and plastic handguard. No M-Lok rail/handguard. I am interested in getting a two point sling and would like to attach using QD swivels. I just ordered a Magpul butt stock which provides for a rear QD swivel. Question: What are my options for being able to install a QD front swivel? Does the old G.I. style handguard allow for the installation of a QD swivel? I could replace the handguard with something like a carbine size Magpul, or I could spend more money and replace the handguard with a much longer one, remove the front sight post and replace the gas block. Or get a longer handguard that works with the existing front sight. I have no plans at this time to mount a light or bipod. Maybe I would want to later, or not, quien sabe. I have a Vortex 1x6 Strike Eagle and don't think the existing front sight is a problem. This "sling business" gets complicated

So you posted this question Christmas eve and nobody has responded yet.
Wow this is an active forum.
I have the magpul MOE stock and I installed a QD mount because Santa was a jerk to me.
I thought they made a QD mount that attached under the traditional handguard but I couldn't find one.
I did get a m-loc handguard and trimmed the front sight.
Sorry I couldn't be more helpful but I do know I'd probably choke to death on a three point sling.

Attached Images

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You can buy a picatinny rail that mounts to a standard carbine handguard.

Then you can add a QD sling mount. First pic is for reference, they sent me the wrong one. Second pic I added a QD sling mount.

I like the Magpul carbine length M Lok handguard. It allows for QD attachment on the left side rather than the bottom.