[ice ice baby] all bullets have a 10% chance to reduce enemy's agility by -3 stacking to -10 for a short duration (scout rifles)

[fireworks] killing an enemy with the weapon has a 50 chance of making him explode, damaging nearby enemies. (auto rifles)

[troll] killing an enemy with the last round of the magazine enables the first round in the next magazine to disable an enemies weapon making it unusable for 5 seconds. (shotgun)

[swift] killing an enemy enables your neck reload to be instant and you gain a 25% damage increase for a short while (hand cannons)

[pin point] your weapon gains an active laser, increasing range and accuracy while zoomed in. [all primary's)

[now you see me, now you don't] shooting this weapon releases a small cloud of smoke around you, reducing the enemies vision on you and increasing range the longer you fire. (auto/scout/pulse rifles)