Firenock

Firenock's full lineup: .166 and .204 lighted nock systems, AeroWeave carbon arrows and crossbow bolts, hunting circuits, batteries, replacement nocks, outserts, and their drop-in titanium fastener kits built for specific bow models.

The titanium kits are worth understanding before you buy: they are not arrow-weight or FOC kits. Each one replaces the steel and aluminum bolts and fasteners on a specific bow's riser, current models from Mathews, Hoyt, Bowtech, PSE, Elite and Darton among them, with grade-5 titanium at the same fitment. The point is cutting roughly 1 to 3 ounces of riser weight to reduce hand torque and string oscillation, not adding weight anywhere on the bow.

The lighted nock systems are a separate decision built around shaft fit. Buy the .166 or .204 system that matches your shaft's actual inside diameter. A lighted nock does add real weight to the rear of the arrow, which pulls dynamic spine back a step, so it's worth rechecking after you install one, especially on a shaft that was already spined tight.

Not sure which nock diameter or spine your build needs? Run it through the spine calculator, and see which lighted nocks actually hold up in the field before you buy.