I probably had the most fun with the FAL DSW assault rifle than any other weapon in Call of Duty Black ops 2 except for the S12 shotgun (click for a guide for the S12 shotgun). The best way to use it is to put the select fir attachment on it and go full auto fire. This guide explains how to use the FAL DSW well and what the best class setup for it is.
At the end of this guide is a YouTube video with a visual version of this guide.
The FAL DSW assault rifle is very good at long range and medium range. But with the select fire attachment and fully automatics fire it is even good at close range. However, it is terrible at hip firing so even at close range using the aim down sights feature is best.
Since the FAL DSW is an assault rifle though, so you will have to use cover instead of strafing to be effective against enemies. Advance towards the enemy from cover to cover and take them out whilst behind cover. But when you do that be sure not to stay in cover for too long. Enemies tend to throw grenades at where you just killed them. When you can’t shoot any more baddies advance to the next cover. The FAL DSW is also a good tool for capturing and holding objectives.
When you encounter an enemy at long range aim down the sights immediately, don’t start with hip fire. There is a very slim chance to hit the enemy from the hip at that range and it actually slows your aiming time. So you are better off to go straight to aiming down your sights. However, when an enemy is at medium range you should always start with hip fire and then aim down your sights since the hip fire often grants an early hit on the enemy which helps win gunfights.
The class setup i recommend is the following:
Since you are always close to the action enemies will tend to throw equipment at you that is designed to kill you in all sorts of horrible ways. Using Flack Jacket and Tactical Mask reduces the chance greatly that you will be affected by enemy equipment. Since you are aiming down the sights to kill enemies and are fairly aggresive you are going to feel the flinch when you are shot at. Using Toughness reduces the flinching you do greatly.
You have to give up either the lethal or tactical grenades in this class. Which one is up to you, but if you go with lethal I suggest you use Semtex or if you go for tactical use concussion or flash grenades. Semtex are better suited for fast combat and the tactical equipment other than flash or concussion grenades are usually more passive. A secondary is great in case you run out of ammunition in your magazine as switching to your pistol is faster than reloading.
Select fire is a must as automatic fire with the FAL DSW brings the benefits from using a semi automatic rifle (high damage and low recoil) and eliminates the draw backs of semi automatic fire (can’t pull the trigger fast enough to reach the fire rate cap and loss of accuracy due to repeated pulling of trigger). When you are taking on enemies at long range you are going to loose them in the iron sights as the little recoil the FAL DSW does have messes with your aim. Using the Reflex Sight will make it much easier to adjust your aim to compensate. Since you are a bit more aggressive the Quickdraw Handle lets you react faster.