https://magpul.com/ms1-sling.html?mp_global_color=118
Its a quickly adjustable two point sling. The "H" slider allows you to switch lengths quickly. So you can pull it tight for retention OR use it to make accurate standing shots (similar to how we do hasty with the GI web sling). You can make it loose around the neck for free movement and if you need to swap the stock to your other shoulder (tacticool John Wick stuff). But I found another feature that isnt advertised: When you slide the "H" slider toward the muzzle to tighten it, it forms a loop ^:)^ If you put your arm inside the loop and pull the H slider back toward your bicep, it cinches up really nice. You've got to play with the length of the sling material for awhile, but I was able to find a sweet spot where it was good in all positions. Its really easy to get in and out of and can be set quickly.
I havent done any live fire with it yet, but, I think its going to be a winner.
Anyhoo, just sharing. I was thinking that this might be a nice piece of kit to display for those who think our shooting is "out dated" or "antiquated". I think this sling allows you to have the best of both worlds (target shooting and tacticool-ness).
I think the price is a little high, but I was able to snag one on sale on Black Friday for $19.