For slings, I’m personally a big 2-point sling guy. Originally I was running the legacy Blue Force Gear and Viking Tactics slings. Since Kyle came out with the Ultralight sling, that’s been my favorite. Another good option would be the Edgar Sherman Design ESD Sling. It’s very tidy and simple, which is good for a sling.
For suppressor covers, I don’t use them on my hunting guns and I only really use them for classes. It’s hard to beat the Armageddon Gear covers. They have sizes for almost everything and offer custom sizes if you can’t find one off the shelf.