Archangel 870 Tactical shotgun kit comes with adjustable stock and forend with rails to mount sling and laser. Available HERE ( midwayusa.com/product/1005252978?pid=860445 ) I hope this helps!

Easiest way is swap out the furniture to this.
opticsplanet.com/magpul-remington-870-sga-stock-forend-set.html
The stock let's you thread the sling directly, then you can add a QD song attachment to the mlok on the foregrip, and a light mount elsewhere on the foregrip.