The free SKS in Cod mobile is available by completing a series of challenges. The SKS is a marksman rifle which is the second gun in this category. It has a higher fire rate then the Kilo Bolt-Action rifle.
Seasonal challenges to unlock free SKS in Cod Mobile
These seasonal challenges upon completing will reward you with the free SKS. You will have to complete 8 such challenges in order to get the gun. The challenge's name is BR Buff.
Challenge #1
For the first challenge all you have to do is play three BR matches. It can be either of the modes in BR like the Classic, Alcatraz, Blitz, Warfare, Sniper Only. you need to just play these matches even if you get killed in the first few seconds of the match it will still be counted.
Challenge #2
In the second challenge you will have to go and drop on a high tier loot zone which will be marked in orange in the classic and Alcatraz mode. Upon landing there you will have to five enemies in order to complete the second challenge.
Challenge #3
This challenge is slightly easier as all you have to do is use the Trap Master in the game 10 times. The trap master will not be available in Alcatraz mode which is why you will have to play the Classic more or the Blitz mode.
Challenge #4
In this challenge you will have to pick up your customized weapon from the air drop three times. This challenge again can be completed in any of the BR modes in the game.
Challenge #5
This challenge is almost similar to the previous one. Here you will have to kill 5 enemies with your customized weapon. This challenge too can be completed in any of the BR modes and the quickest way to do so is by waiting for your opponents to come to the air drop.
Challenge #6
This is one of the easiest challenges so far, as all you have to do is pick up an epic weapon in BR three times. The epic weapons are the weapons in purple. You can find an epic weapon in abundance in the BR map.
Challenge #7
In this challenge you will have to pick up a Legendary weapon in the game and then use it to kill five enemies. This is not an easy challenge but you can use 2-3 games in order to complete this challenge. The legendary weapons will be marked in orange and can be found on the map itself or can be easily found from the air drops.
Challenge #8
This is the last challenge that you will have to complete to unlock the free SKS in Cod mobile. This challenge is the hardest in the bunch. You have to get hold of an Annihilator from the air drop in the BR and then use it to kill 5 enemies. The Annihilator is a difficult weapon to get hold of as you will always have to be the first at the air drop and even then you may or may not get hold of this weapon.
The only other way of getting the SKS in Cod mobile is by purchasing the lucky draw which as discussed before is very expensive like the crates and not everyone can afford buying it.