I haven't played a single match today.

all you need to understand each gun has a different purpose

chakra= more DPS at melee range bonus points if your using flamethrower q while this is equipped as secondary dont forget to ult as chakra is primary. lifesteal Q form on use grants additional chakra daggers.

flamer= is more AOE basically its a bullet spread after the target so u can hurt a skillshot blocker while hurting the backliners at the same time. bonus points if you use chakra turrets with it to enhance the damage spread. gravity weapon is enhanced also if you flame Q them to root a group at once.

lifesteal form= its a sustain/aggressive weapon that has a kai sa styled dash but it attacks (by priority) the closest champ in range bonus points if this is paired with gravity (burst/cc) or chakra (sustained damage on chakra weapon) as you can do more damage after your dash. flamer grants advanced waveclear with this weapon.

sniper (aka the halo weapon)= its basically just like cait autos but its passive is a mark thats infinite range ONCE to consume the mark. bonus points if you pair with flamer on flamer Q it spreads the mark to attack more targets (not sure if it consumes the marks of other targets or just links the dmg). using chakra's turrets with this enables far range marks on targets hit by it.

gravity gun= its a weapon that delivers a slow (think ) per aa that can be transformed into a Root for 1 second on Q this weapon uses no other weapons as a 'bonus' Q alone its ability is however added to the others (except sniper). bonus points if you pair with flamer/chakra/sniper. sniper can gift it the mark and you can gravity AA the target using the sniper mark then root it if you wish.

i hope you respond to this as to how u see this.