I am subscribed to this firearms site and saw this S&W AR-15. It states that is has a new aluminum S&W slim handguard (S&W makes handguards?). And, this is the game changer; the 1/8 twist 5R barrel is used on this AR!
This looks like a nice AR-15. I like it!
Smith & Wesson M&P15X 5.56 16" Barrel M-LOK 30+1 11535 - Gunbuyer