This looks kinda like a Tavor??
“And slings are good for better control while shooting”- Read this again!! While I was in the Army my M16(A1 or A2) wore the good old black nylon “strap” sling. I kept the loop long, and carried the weapon slung buttstock side up across my back. If I needed it quickly I could shrug and swing it under my strong side arm, twist it up into the ready position with the strap twisted around my weak side (forward) hand for stability in about 3/4 of a second. My two ARs, and both my Mini-14 and Mini-30 are still similarly equipped. I acquired the slings and buckles on the surplus market for a whopping $6 each.I'm about as not left as they come but I like 20's. They're a better length for positions shooting.
And slings are good for better control while shooting. That's what Appleseed teaches anyway and it works.