Went to the range yesterday and shot a box of Remington STS Light Target Loads through my M4, without any malfunctions. After reading this thread I was concerned they might not work, but they did. Taking a skeet class this March, and think I will use the Benelli instead of my trusty old Weatherby Model 82. Only gripe I have with the M4 is that stock recoil pad sucked when shooting in a T-shirt, as we do here in Arizona. Replaced it with a Limbsaver and now it is a joy to shoot.