What is better M4A1-S or M4A4? Since the nerf, the M4A1-S has a slower rate of fire, a larger recoil pattern and less armour penetration. Some people say they still prefer the M4A1-S because the slower rate of fire means the recoil pattern is easier to control. Personally, I now use the M4A4 as the better armour penetration and fast rate of fire means that it is good to get you out of sticky situations. It also has a larger round of ammo and more magazines, so it is a good weapon if you spray a lot or often get caught in situations where you run out of ammo with the M4A1-S