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There is a Legacy version here.

PFS StandardBackpack BallistaItem 1

Legacy Content

Source Guns & Gears pg. 62
Price 18 gp; Damage 1d12 P; Bulk 2
Hands 1+; Range 180 ft.; Reload 1 minute
Type Ranged; Category Martial; Group Crossbow

This complex wooden device, worn on the back, contains a miniature ballista on a retractable arm. As an Interact action, you can pull a lever to deploy or retract the ballista. As long as it remains deployed, you must hold the ballista using that hand or some of the components spill out onto the ground, just like dropping any other weapon. While deployed, the device opens and raises the ballista up over your shoulder. While retracted, the ballista and its mount slide down and are concealed within the device. Although a backpack ballista packs a punch, the device is a challenge to operate. Reloading it takes 1 minute and can't be done while worn. As normal, you can't wear a backpack ballista with another backpack.

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.

Crossbow: The target takes 1d8 persistent bleed damage. You gain an item bonus to this bleed damage equal to the weapon's item bonus to attack rolls.