Rifles

Your best two rifles are considered to be the M4 Carbine as well as the ever famous AK47.  These two weapons are extremely powerful and accurate when used correctly.  First of all lets clear up any confusion about the M4.  Silenced the recoil is less but it does less damage, also a silenced weapon draws less attention from a swarmed enemy leaving your chances of survival much greater.  I prefer to silence my weapon because I like the way it shoots better.  Anyways, I suggest firing in two to three shot bursts for the M4 unless the enemy is very close where you better unload at him with all you have.  With the AK47 the recoil is extremely large and in a somewhat random patter making your best bet a 2 shot burst.  All of these "bursts" should be directed at the enemy's neck or right below their head; the first bullet weakening them and the second finishing him off with a headshot since the recoil will bring it up ever so slightly.  And remember, practice makes perfect.