Karbide-Machines
Ranged weapons manufactured by Diaspora-based Karbide-Machinas integrate nanofiber grips to ensure a customer never unintentionally loses the weapon. The company makes only small arms, longarms, and sniper weapons with these grips, which increase the weapon’s price as normal for such grips.
Grip, Nanofibre
Weapons can be fitted with special grips that provide various advantages. You can combine grips by paying the combined price of the grips, but only if all grips are integrated into a weapon. Their benefits stack. A nanofiber grip strengthens your hold on a weapon. While you wield the weapon, microscopic fibers act as setae, clinging to your hands. These fibers grant you a +4 circumstance bonus to AC against disarm combat maneuvers that would disarm you of the weapon.
Source
Armory pg. 56
Weapon Effect
if or [{weapon.type == smallArm}, {weapon.type == longarm}, {weapon.type == sniper}] then set item.price to (item.price + 750);