Firenock, in 2016, had a nock for almost every crossbow serving size from 0.125” to 0.165” besides 0.135.” Therefore, “U” nock was developed to fill that gap.
To fit crossbows with a 0.135" serving and arrows with a 0.300" ID with triggers / anti-dry-fire (ADF) systems that require a short-pronged design.
Available in 18 colors / shades (3 nock colors x 6 LED colors)
Full system, on average, weighs only ~31 grains
Ready for the only target lighted nock system that is IBO & ASA approved: Firenock “T” circuit
Ready for hunting and intermittent lighted nock systems that stay lit / blink for up to 21 days with a BL battery powering a Firenock “H” / “I” red circuit
excellent nock that I mount on the Zombie Slayer that I use on my Ravin. A very few nocks with the correct string attachment.