HK21

Our fourth weapon is the HK21. This weapon is one of the default weapons in the game.
This weapon is known for its high damage and fast firing rate.

Shots to Kill: 3 Close/3 Far
Rate of Fire: 750 rounds per minute
Magazine Size: 30 Normal/60 Extended
Reload Time: 3.75 seconds

 Secondary:

I suggest using China Lake as the secondary weapon. HK21 is mostly used in objective games, China Lake will help a lot for group killing or killing players near their objective.

Attachments:

Primary Weapon: Extended Mags is the perfect fit of attachment for this weapon. It will increase the HK21's magazine size to 60, allowing you to be more aggressive without worrying about reloading every time. If you are using the Warlord perk, I suggest you use Extended Mags and Red Dot Sight.

Perks:

Perk 1: I suggest using Lightweight. Using the HK21 will make you move pretty slow so a little boost of speed from Lightweight might help. Another good perk for this class setup is Scavenger or Flak Jacket.

Perk 2: Hardened just help your weapon penetrate more on objects, but the pro version of this perk is not that bad. The reduced flinch effect is very useful.

Perk 3: Tactical Mask will give you protection from Nova Gas. The pro version of this will make you almost invincible against Flashbang and Concussion. Another good choice for this class setup is Marathon.

Equipment and ETC:

For Equipment, I suggest using Jammer. This is extremely useful if you don't have the Hacker or Flak Jacket perk. Always plant a Jammer before entering buildings, so you could disable equipments like Claymore and C4's.

For Tactical, use Flashbang. It blinds your enemies completely making them completely defenseless, but effect only lasts 3-4 seconds so you have to be fast and aware of where the affected enemies are.

For Lethal, use Semtex. You do not have to worry about throwing grenades at campers inside a room because this class is not for rushing. Semtex is good for objective games like Domination, Demolition, and etc.

Killstreak Rewards:

SAM Turret is useful with this class setup especially if you do not have any launchers equipped. It will destroy Spy Planes and other aircraft automatically. Be sure to put this on a spot that it is least noticeable.

Blackbird is very useful for this class setup. It helps a lot when you see where your opponents are and which way they are facing so you could plan a good attack strategy.

Attack Dogs is good for breaking down campers, plus following where the dogs go gives you  a good idea where the enemies are.

Specializes in maps like:

Launch

WMD

Hanoi

Olympia

Our third weapon is the Olympia. This weapon is one of the default weapons in the game.
This weapon is known for its high damage and its wide spread area.

Shots to Kill: 1 Close/1~4 Far
Rate of Fire: 212 rounds per minute
Magazine Size: 2 Normal
Reload Time: 3.30 seconds

Secondary:

ASP is the best choice of secondary weapon with this class setup. ASP has the fastest reload time among all of the pistols and it has the fastest pull out time. Only use this gun if you happen to run out of ammo or if you have to shoot someone far away from you.

Attachments:
NO ATTACHMENTS IN ANY WEAPON

Perks:

Perk 1: I suggest using Flak Jacket. If you are using the Olympia you will probably rush in to rooms to get close to your enemies, so Flak Jacket will help you to survive any explosions from the explosive your enemies planted. If you are not a fan of this perk you could also use Lightweight or Scavenger.

Perk 2: Sleight of Hand is the perfect perk for this class setup, it will make your ASP's and your Olympia's reload time faster. You only have 2 shots with the Olympia then it will reload, using this perk will help a lot.

Perk 3: Marathon is very important with this class setup. You need it for extra sprint time so you could get to your enemies closer to make the damage of your Olympia better.

Equipment and ETC:

For Equipment, use Tactical Insertion. Place this on a hidden spot near the enemies base or near an objective so if you spawn you do not have to run all the way across the map.

For Tactical, use Concussion. Using this will cause the enemy to be stunned, slowing them down so you could get close to them to make the Olympia's damage better.

For Lethal, use Tomahawk. You can use this on enemies close or far away from you. This is highly effective on mid-range combat, if your Olympia can not do much damage in mid-range combat just throw the Tomahawk and it will do the job. Tomahawk only has 0.01 seconds of preparation time unlike the Frag which has 0.73 seconds preparation time.

Killstreak Rewards:

For this class setup, use mini-map based killstreak rewards like Spy Plane. With this class setup it is important to know where your enemies are because you have to get close to them.

Counter Spy Plane is essential with this class setup. This jams you enemy's radar allowing you to sneak up on them without them tracking you.

Last but not the least, Blackbird. This is the same as Spy Plane but more detailed and accurate.

This gun specializes in maps like:

Summit

Grid

Firing Range

M16

Our second weapon is the M16. This weapon is one of the default weapons in the game.
This weapon is known for its high damage and low recoil.

Shots to Kill: 3 Close/4 Far
Rate of Fire: 938 rounds per minute
Magazine Size: 30 Normal/45 Extended
Reload Time: 2.03 seconds

Secondary:

M72 LAW is good for this class setup. You can use this to destroy spy planes (which is important if you don't have Ghost perk) or any other aircraft. You can also use this on a group of people for multikill.

Attachments:

Primary Weapon: For this weapon I use Suppressor, it reduces the recoil of the M16 and it hides you from the radar when firing. If you are not used to the iron sight of the M16 you could also use the Red Dot Sight attachment. If you are using Warlord perk, I suggest using Red Dot Sight and Dual Mags.

Perks:

Perk 1: Hardline is not a bad choice for this class setup, considering that you are using a 3 round burst gun, and that kind of gun is not made for group killing or rush killing. It's good to have killstreak rewards on lower killstreaks.

Perk 2: Hardened just help this weapon penetrate more on objects, but the pro version of this perk is not that bad. The reduced flinch effect is very useful.

Perk 3: I suggest using Second Chance perk. If you are using a semi-automatic or 3 round burst gun, for sure you are going to have a fast trigger finger. You could use that fast trigger finger when you die, given a second chance to pull out a gun and shoot your enemy. But if your not a fan of this perk, I suggest using Marathon for longer amount of sprint.

Equipment and ETC:

For Equipment, I suggest using Jammer. This is extremely useful if you don't have the Hacker or Flak Jacket perk. Always plant a Jammer before entering buildings, so you could disable equipments like Claymore and C4's.

For Tactical, use Nova Gas. It helps a lot in objective games, You could use the Nova Gas for extra damage allowing you to kill the enemies with only 1-2 shots.

For Lethal, use Semtex. You do not have to worry about throwing grenades at campers inside a room because this class is not for rushing. What you do is just lure them with Nova Gas then let them come to you, so before they get to you, they are already damaged by the Nova Gas and you could kill them with only 1-2 shots. Semtex is good for objective games like Domination, Demolition, and etc.

Killstreak Rewards:

For this class setup I suggest using high killstreak rewards like Attack Helicopter. If the Attack Helicopter is attacking enemies you could easily see where the helicopter is shooting at, thus giving you a good idea where the enemies are, giving you the advantage.

Blackbird is not a bad choice for this class setup. Knowing where the enemies are is very useful.

Attack Dogs is good for breaking down campers, plus following where the dogs go gives you  a good idea where the enemies are.

This gun specializes in maps like:

Grid

Havana

Cracked