Here is complete guide to the perks found in Call of Duty 4, as well as some personal tactics gleaned from my first few days with the games, as well as from talking to others. The perks are a very satisfying addition to CoD in my opinion, and add another level to the game, making it very addictive as you try to collect all the perks that completely change the way you play the game. The levels needed per perk are listed after the perk name.
Bomb Squad (14)
The Bomb Squad perk allows you to detect explosives planted in the map. This is useful if you are up against people who just love using bombs, and have C4 and Claymores hidden throughout the map. The Bomb Squad perk is unlocked at level 14 – Staff Sergeant I.
C4 Explosives x2 (2)
The C4 Explosives perk gives you two C4 explosives that you can detonate remotely using the fire button, or if you are using your primary weapon you can detonate them by double tapping the “use” button (the default mapping is F). In Call of Duty 4, there are no binoculars, so make sure you are aware of your enemy’s location before setting them off – I find this also a bit difficult, but on some level night vision comes in handy. C4 Explosives are unlocked as soon as you unlock the Demolitions Class – level 2, Private I.
Claymore x 2
Claymores are basically a mine that you can plant in the game to blow people up when they are in range. The calymore packs use light sensors, and typical will be visible before you stumble upon one. The explosion is very directional, and because of this the Claymore perk isn’t very useful in situations you would typically use mines. That said, I’ve had good luck hiding these things just around corners out of sight where people can’t see the garish red beams emanating from these things. Claymores are unlocked at the onset of the game.
RPG-7 x 2
The RPG-7 x2 perk gives you two ground-to-air missiles that are very useful for shooting down helicopter air strikes. It should also be noted that they can explode cars and other destrutible objects on the map, and are very fun to shoot at spawn points, followed by a cooked nade.
Special Grenades x 3
This is my favorite among the Perk 1 group – this one gives you 3 special grenades as opposed to just one. Why is it my fave? Well, combine this with stun grenades, the radar, and the “x” indication that you’ve hit someone, and it’s a great way to find out where people are, run up to them, and knife them with your hobo knife, even from far away! The Sepcial Grenades perk is unlocked by default.
Frag x 3 (41)
The Frag x3 perk gives you three frag grenades – simple huh? Not really, once this is unlocked, you’ll find the maps littered with grenades – try as you will to pick them up and throw them back, more are on the way! This perk is unlocked at level 41 – Colonel I.
The Bandolier perk gives you much more amo for your clip, and is my second favorite among the Perk 1 set because it goes so well with the Double Tap perk. If you like to sprint around, doing some spray and pray while having a beer like me, this is definitely a must-try. The Bandolier perk is unlocked at level 32 – Captain I.
The Juggernaut perk, well… makes you a juggernaut! You can take a LOT more damages than usual, and still be standing. Typically this means that I can survive 2 badly fought 1-on-1 rounds and still be running around like a chicken with my head cut off. This perk is unlocked straight away as far as I can tell.
Sleight of Hand (20)
Sleight of Hand helps you to reload weapons a lot faster, and if you can’t aim, like to spray and pray, and run around without reloading or watching your amo, this may be for you. Truth be told, this comes in very handy for shotgun and SAW users, but just about any one can use this. Sleight of Hand is unlocked at Master Sergeant I (Lv20).
Stopping Power gives your weapon some oompf, and remoes the pew-pew! This is a good addition to weapons like the Mini Uzi, that while very fast, certainly lacks power. The Stopping Power perk is unlocked by default.
UAV Jammer (11)
The UAV Jammer perk helps to keep you off the radar, even when firing shots. This perk is useful against seasoned players who have become accustomed to watching the radar like hawks, and know all of the hiding places already. I highly recommend trying this with the Dead Silence perk and a knife. UAV Jammer is unlocked at level 11, Sergeant I.
The Sonic Boom perk gives your explosions some added range, and is great when used with the Martyrdom perk because it will see you taking out many people at a time as the grenade you drop will have a larger blast radius. This perk is unlocked out of the gates.
Easily the best perk in the game, Overkill allows you to carry two primary weapons at once, in the primary and secondary slots. This means you can fulfill your dreams of being a sniper/shotgunner! You simply change weapons to where your pistol would be, and there’s your other weapon. This is great because you can switch weapons faster than you can reload, in my case, but also because it opens the maps up so that everyone can carry an ACOG weapon as well as an LMG/SMG or what-have-you. Highly recommended, worth all of the effort.
Double Tap (29)
Double Tap increases the rate of fire for your weapon. This really helps balance things out for weapons that have a slow rate of fire, and makes some weapons like the M16 MUCH better. I highly recommend using this perk with the Bandolier perk as you’ll be going through a lot more amo than usual. The Double Tap perk is unlocked at level 29 (1st Lieutenant I).