U Style Intermittence/Blinking Firenock Lighted Nock System (3)

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Firenock U style intermittence/blinking lighted nock system for 0.300” ID class crosbow arrow that clip onto a 0.135+/-0.05" serving.
(U3i-R => U=U style nock, 3=3 pack, i=intermittence, R=Red LED)
  • 3 “I” series intermittence/blinking circuits in red/green
  • 6 “U” style nocks in red/green
  • 3 Extreme Shock End Caps with O-rings
  • 1 end cap Installation tools
  • No battery is included in the pack, and you must purchase it as an option (Batteries in the picture is for demonstration purpose only)


  • One battery 3-pk; click (BR, BL) for detail spec of the 2 different batteries
  • (AG0GEL) super glue gel at $6.00 instead of the normal $10.95
  • Extreme shock matched weight pack, click (PUx) for more detail about it