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There is a Legacy version here.

PFS StandardFlintlock Musket

Concussive Fatal d10 
Source NPC Core pg. 50
Favored Weapon Cixyron
Price 5 gp; Damage 1d6 P; Bulk 1
Hands 2; Range 70 ft.; Reload 1
Type Ranged; Category Simple; Group Firearm
Ammunition Firearm Ammunition (10 rounds)

The flintlock musket includes an external firing mechanism and an efficient and relatively compact frame. Though lacking the range and firing power of the arquebus, the flintlock musket is popular among civilians for its ease of use.

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.

Fatal d10:

The fatal trait includes a die size. On a critical hit, the weapon’s damage die increases to that die size instead of the normal die size, and the weapon adds one additional damage die of the listed size.


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.

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

Specific Magic Weapons

Duchy Defender, Musket Staff of Force, Musket Staff of the Void, Solar Shellflower