I've been playing COD since COD:WWII I have been most successful in BO4 where I had a 1.4 overall K/D in public matches playing mainly as an AR. My friends and I got into ranked play during BO4 and were very successful. When playing ranked I played switch between AR and SMG. My go to AR was the ICR-7 and my go to SMG was the Saug. In MW I almost exclusively used the M4 as a main AR role sitting back slightly and picking off enemies as they would push the hardpoint or dom flag.