I agree with@IRaMPaGe , the blueprints for the most part are shyte. They are only good to have when you have no attachments unlocked for the weapons at all so it gives you a little extra for the time being. To be completely honest you are better off just working on your favorite guns and unlocking what you can. It is super easy when double weapon XP is active. If you want advise on what guns are good I'll put my 2 cents in. AR - M4A1 (the best AR in the game and one of the best guns in general). SMG - MP5 (The best SMG in the game, personally I love the P90 as my SMG of choice since you can pick up decent MP5 in the game). Sniper - HDR or AX50 (both great depends on your playstyle). Shotgun - (Dont worry about them, they are trash in WarZone). LMG - PKM (Great LMG but causes your mobility to hinder as well as any LMG but provides a big punch with a massive magazine). For WarZone you want to build range, control, and accuracy. There are a lot of open field areas that you really need it. Personally I build that on all guns. That being said, if you dont need Ghost, I would build the M4A1 as the previously mentioned build, and build P90 as mobility so you can maneuver in close range flights. Just know, UAV is very powerful in this game mode. I run a P90 class with a Sniper class and a M4A1 with a rocket launcher class. Now, as far a blueprints you want to complete via challenges, well to be honest, I have no clue since the system in this game suck. From challenges not completing, having to select 1 at a time, not being able to see what group of 1 challenge unlocks, ect.. it's just garbage. You will have to google what you want for what gun. Just not worth the time to be honest. You are better off working on the gun and unlocking what you want. Via the FG App