Now that I have my new upper I realize I need a new sling attachment with M-LOK.  Anyone have one they like?

I am thinking of going with these:

https://www.magpul.com/products/m-lok-qd-sling-mount

https://www.magpul.com/products/qdm

I have the magpul m-lok sling mount, it mounts very solid, no issues. I however user the standard 1.25 sling swivel, I personally have not found a reason for the more expensive sling swivels, but my life does not depend on them on a regular basis so i'm not quite sure how they will hold up in the long run.

 

I put a Magpul M-Lok swivel stud on my SPR to mount a bipod.  It is very solid.

Those will serve you very well. Excellent choices.

I have the magpul m-lok sling mount, it mounts very solid, no issues. I however user the standard 1.25 sling swivel, I personally have not found a reason for the more expensive sling swivels, but my life does not depend on them on a regular basis so i'm not quite sure how they will hold up in the long run.
 

Have one of those as well, very solid.

I went with Magpul. Primary Arms is still running good deals. Thanks guys!