If your magazine cap has a sling stud, you could mount it there. Or, you could install a magazine/barrel clamp and mount a sling on it. Another possibility is to mount it like this: http://www.gggaz.com/remington-870-looped-sling-attachments.html I always prefer looped sling adapters, so that I can attach/detach the sling easily using QR mash or snap hooks.