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PFS StandardKestros

Concussive Propulsive 
Source War of Immortals pg. 147
Price 2 gp; Damage 1d6 P; Bulk L
Hands 1; Range 40 ft.; Reload 1
Type Ranged; Category Martial; Group Sling

The kestros is a type of sling that fires special ammunition with wing-shaped fins and a pointed end. The thongs of the sling are of uneven length, one shorter and one several inches longer, around an open loop to cradle the ammunition as the sling is spun.

Traits

Concussive:

These weapons smash as much as puncture. When determining a creature's resistance or immunity to damage from this weapon, use the weaker of the target's resistance or immunity to piercing or to bludgeoning. For instance, if the creature were immune to piercing and had no resistance or immunity to bludgeoning damage, it would take full damage from a concussive weapon. Resistance or immunity to all physical damage, or all damage, applies as normal.

Propulsive:

You add half your Strength modifier (if positive) to damage rolls with a propulsive ranged weapon. If you have a negative Strength modifier, you add your full Strength modifier instead.


Critical Specialization Effects

Source Core Rulebook pg. 283 4.0
Certain feats, class features, weapon runes, and other effects can grant you additional benefits when you make a Strike with certain weapons and get a critical success. This is called a critical specialization effect. The exact effect depends on which weapon group your weapon belongs to, as listed below. You can always decide not to add the critical specialization effect of your weapon.

Sling: The target must succeed at a Fortitude save against your class DC or be stunned 1.