What size quick detach swivel fits the hole in the gas block on an M&P15 Sport II?

[Plunky McPlunker]

What size quick detach swivel fits the hole in the gas block on an M&P15 Sport II?

Hello... I wanted to mount a two-point sling. It appears there is a hole on the gas block for attaching a quick detach swivel for a sling. Anyone know which one fits or can you recommend one that fits? Thanks for any help.

 

[bamashooter]

The size is standard. Loop size can vary depending on your preference of sling width.

 

[double-dipper]

Is the gas block one that is doing triple duty? serves as gas block, flip up front sight and quick attach for sling?

In my opinion I would not want the sling attached to the front sight post.

I would add the quick detach to the handguard, use whatever you have an M-lok, keyMod or picatinny rail.

I have Magpul QD on all three of mine.