In my opinion with the current state there are precise tiers for weapons, unlockable being definetely lowest. If you compare the free SMG with for example Deathstalker or MPX, you will notice that the unlockable or the free one have either all stats lower or 1 stat 1-2 points higher, while multiple stats 5+ points lower, resulting in far lower weapon stats overall than the weapons you buy for cash. But since you can buy the weapons fairly quick by playing regularly, there is no pay2win involved.
That being said, everyone has his own preferances, so if you disagree with my list, please state your opinion backing up with reasons. On top of that, customizing could be different from what I suggest, since I sometimes focus on improving the strength of the weapon, sometimes on denying the weakness. For example SMGs are best used in close combat where you need movement speed for reaching targets quick and strafing, so I customise only minimal movement speed impact, while on a MG I would slot as much stability as possible to allow longer burst fire and spraying.
I compare fully customised weapons and not their basic forms, because some weapons are actually really close in score in their basic version, but one offering more customisation allows it to achieve higher end score.
Based on frequently used weapons by top players on EU servers, backing up with my own experience, including short reason description, the weapon tiers are:S Tier
Best tier overall, allowing achieving most kills / best outcome in most situations.SEBURO C-30
- Assault Rifle - Most expensive rifle on the market
The newest addition to the game and as in most cases with new weapons, it directly jumps into S Tier. Not because its new and people don't know to counter it yet, but because new additions are often not correctly balanced. Since the changes to recoil and spread pattern in the OB patch and the hitbox fixes, quick shooting assault rifles and MGs started to take over the majority of kills. C-30 is the best example of having high fire rate making you able to spray over short, medium and even long ranges without the need of slow tap- or burst-fire. Compared to KH-417 the new C-30 has 3 points lower damage (does not matter in most cases since the rifle is 3-shot anyway and with range-CBC it can even 3-shot if you hit into arms/legs by accident), 11 points less accuracy (not really the problem at the moment since the spray pattern of most weapons is really tight), but for that 11 more fire rate and 5 points more in stability, pushing C-30 not only to highest point weapon, but also with current balancing allowing spraying with almost no recoil and hitting enemies insanely accurate, killing in milliseconds.F-MAS G1
- Assault rifle - Expensive market weapon
F-MAS is one of the newest additions to the weapon arsenal and it definetely got fame all across the servers rather quick. Having same firerate as the quickest shooting SMG EVO it can stuff your enemies with holes much quicker than any other AR while still having rather high damage and accuracy compared to SMGs or some lower tier assault rifles. It fits really good in mid range and is one of the best choices on close range after SMGs. Strangely it feels still fairly accurate on long distance aswell, resulting in still a lot of headshots given with fire bursts. The stability and small spread pattern allow for amazing spraying with F-MAS and supplied by the high fire rate the chance to hit while spraying is amazing.