Depends on how you want to run your sling.
Single point sling attach this qd sling swivel to the hole in the stock https://magpul.com/firearm-accessories/slings/mounts/qd-sling-swivel.html
Or if you want to run a 2 point sling you will need that one and this attachment, connected to the mlok on the handguard
https://magpul.com/catalog/product/view/id/5458/s/m-lok-qd-sling-mount/category/53/

Will, you just need an M-LOK Sling Adapter for the Hand Guard : - amazon.com/GoldCam-Release-Swivels-Attachment-HandGuard/dp/B07RX1HRBD ------------ The hole in the Rear Stock is the hole for a Quick Detach Sling Mount pictured here: rifleshootermag.com/editorial/hammerli-tac-r1-22-c-review/383226

There are QD sling swivel sockets on either side of buttstock.