Welcome to main Firenock lighted nock system FAQ page, where you'll find specification and feature questions not answered on individual product pages. Note that this page is separated into three sections for your convenience. Find details about each section as well as links to other Firenock FAQ pages below.
General FAQ: As the name implies, this section is the general or generic questions one might have about Firenock -- features, characteristics, use, maintenance, etc.
Battery FAQ: For any specific questions on Firenock batteries (and if you couldn't find your answer in troubleshooting [see below]), this is your section.
Extreme Shock End Cap FAQ: If you have any questions about the extreme shock end cap system (including ESEC troubleshooting concerns), this is the place.
On other pages...
GQ1: What feature(s) makes Firenock the “The Most Advanced Lighted Nock®”?
The Firenock lighted nock system is not just a simple wire with an LED attached or some custom integrated circuit glued into a stock nock. Firenock is different because it was designed differently. It was designed, with no expense spared, to be as reliable and consistent as possible -- it was designed to last a lifetime. Loaded with multiple independently claimed patents, Firenock's uniqueness is found upon its PCB or printed circuit board. Including a G-switch, a motion sensor and digital timer, our lighted nock system's PCB will last for 30 thousand shots.
Let's get into each component on our double layered PCB. The G-switch. See, the Firenock activates itself without a visual or physical switch. Instead, our G-switch, an acceleration switch, as the name implies, requires a minimum of 65 Gs of force (with a tolerance of three degrees). This precondition eliminates the chance for accidental activation or deactivation. The motion sensor and digital timer, sitting on the second layer of the PCB, on the VLSIC or very-large-scale integrated circuit, further assist in that. A closed system, the motion sensor and digital timer work together to ensure that only YOU can turn off (and on) your Firenock lighted nock system. See question GQ4 to learn exactly how.
Though spectacular alone, our PCB is accompanied by equally spectacular consumable accessories. For example, our nocks. Made with the best polycarbonate (Makrolon™ by Bayer®) and dye (Makrolon™ by Bayer®), every style of our nocks is guaranteed to be the same weight, no matter what color. The mold itself, in particular, took 160 hours of engineering and 10 molds to perfect. Now, a multiple piece mold is used to make each nock. Further, molded in its own cavity via virgin flow, every nock can and does have its own mold mark and cavity number for quality control. All this, to ensure the best light transmission and consistency.
Other essential Firenock components include our custom batteries and custom extreme shock end caps. Epoxy-sealed and chemically formulated, our batteries have an average shelf life of up to 13 months (when stored at room temperature) and can work from below freezing to above 100° F. See battery page for specifics. Our ESEC, on the other hand, are CNC machined and thus meant to last forever.
"The above mentioned may sound very scientific and technical, but without these details it is not possible to achieve perfection. Bringing you "The Most Advanced Lighted Nock" is not an easy thing and it's definitely not an inexpensive venture. Firenocks are simple to use and reliable because we put so much effort in them and that is how we ensure that the Firenock that you purchased will work as described."
For even more information on your Firenock lighted nock system style's specific features, check out our Firenock Selector.
GQ2: Why is the Firenock lighted nock system more expensive than other brands of nocks?
Besides all the reasons we've listed above in GQ1, let's articulate some more specs about the G-switch (the most expensive component of the Firenock lighted nock system). Our G-switch is the smallest acceleration switch ever built commercially at only 2 mm in diameter and 6 mm in length. Due to being hermetically sealed and accompanied by 24k gold-plated components, our switch can handle no less than 12,000,000 cycles of activation and up to 15,000 Gs of force (from a perpendicular direction from the G-switch pin). ...Isn't it easy to understand why Firenock lighted nocks are more costly than other brands of nocks?
GQ3: What do the Firenock lighted nock system codes mean? See this page.
GQ4: How do I shut off a Firenock lighted nock after it is lit?
Follow these directions carefully.
- Wait at least 6-8 seconds after activation before trying to deactivate the system.
- Lift the arrow (nock end down) no less than 8 inches (20 cm) above a semi-hard flat surface*.
- Drop the arrow (still nock end down) onto the surface via gravitational force. Upon impact, the Firenock will deactivate automatically. If the lighted nock does not deactivate, repeat steps 2 & 3 and increase the distance by two inch (5 cm) increments until the unit deactivates.
*A pine block, the top of your boots, or the floor inside your truck are good examples of semi-hard flat surfaces. If the Firenock does not shut off after a free-fall distance that is as high as 12" (30 cm), please return your Firenock for warranty replacement.
GQ5: How many light functions are available for the Firenock lighted nock system?
The Firenock lighted nock system is available in three different light functions: Hunting (H), Target (T), and Intermittent (I). The Hunting (H) circuit, for standard or common sized arrows, will remain lit until the battery runs out or is manually switched off. This function is also available for slim arrows (N) and ultra-slim arrows (Z). The Target (T) circuit, for standard or common sized arrows, will turn off automatically after 17 seconds. This function is also available for slim arrows (K) and ultra-slim arrows (0). The Intermittent (I) circuit, for standard or common sized arrows, will remain lit for 6 seconds and will then blink until the battery runs out or is manually switched off.
GQ6: How many color combinations are available for the Firenock lighted nock system?
The Firenock lighted nock system boasts complete interchangeability. There are currently up to 9 nock colors per style and up to 6 LED circuit colors per series of circuit, with thus a total of 54 color combinations. All styles of Firenock are immediately available in all 6 LED colors. The same cannot be said for nock colors. See this page for more information on currently available nock colors.
GQ7: What color of Firenock should I choose?
Firenock offers up to 54 colors of lighted nocks to suit almost all lighting conditions. In most cases, one cannot go wrong with a red nock on a red LED. For those with color blindness (red and green) however, we recommend a yellow or blue nock on a green LED. For evening or full moon night hunts, we recommend a green nock with a green LED. And lastly, for indoor lighting (fluorescent) or dark moonless night hunts, we recommend a blue nock on a blue LED.
GQ8: Are Firenock lighted nocks made in the USA?
Firenock LLC is located in Henry, IL USA. In addition to its main components being made in the USA, Firenock lighted nocks are designed, packaged, and assembled in the USA as well.
GQ9: How heavy is my Firenock lighted nock system?
Here is a list that ranks the lighted nock system -- nock + circuit + battery + ESEC -- from lightest to heaviest.
- "G" Style : ~20 grain
- "A" Style : ~21 grain
- "E" Style : ~24 grain
- "F" Style : ~31 grain
- "S" Style : ~27 grain
- "V" Style : ~30 grain
- "C"/"U"/"Y" Styles : ~32 grain
- "D"/"D2"/"J"/"M"/"Q" Styles : ~33 grain
GQ10: How do I know which circuit series I have?
To tell which function your circuit has, there is a letter (H/T/I) on one side of the circuit; H = Hunting, T = Target, I = Intermittent. If there is no letter on the circuit, the easiest way is know its function is to activate it.
GQ11: How interchangeable are my Firenock circuits with different styles of nocks?
There are three groups of Firenock lighted nock circuit sizes. Within each group, the circuits are interchangeable with any available style. The most common size of circuits, H/T/I, fit "C", "D", "D2", "F", "J", "M", "Q", "S", "U", "V", & "Y" style nocks. For slimmer arrows, the N (hunting) and K (target) circuits fit "A" and "E" style nocks. And lastly, for ultra-slim arrows, the 0 (hunting) and Z (target) circuits fit "G" style nocks.
GQ12: What does the "G" in "G-Switch" stand for?
In physics, the unit for acceleration is "g" or namely "g-force". It is usually used in aircraft and rocket science.
GQ13: What happened to Firenock GA, GE, GF and GS?
GA, GE, GF and GS are now referred to A3h-R, E3h-R, F3h-R and S3h-R. See this page for more information on what these codes mean.
GQ14: Will there be a better Firenock soon?
Firenock's Lifetime Refresh / Upgrade / Side-Grade Service will let you get the latest version of Firenock lighted nock with only a small cost.
GQ15: Can I use Firenock during hunting season in my state (US)?
As of August 2017, lighted nocks are legal for use during archery hunting season in every state in the USA. For more details on the latest regulation updates, see below.
2010 update: It is legal to use lighted nocks in North Dakota.
2012 update: It is legal to use lighted nocks in Wyoming.
2013 update: It is legal to use lighted nocks in Washington.
2014 update: It is legal to use lighted nocks in Colorado.
2015 update: It is legal to use lighted nocks in Oregon.
2017 update: It is legal to use lighted nocks in Montana.
GQ16: If my game is harvested using Firenock is it ineligible for the record books?
As of August 2014, the use of any lighted nocks for harvest is recognized as legal for the P&Y Harvest Record Book.
GQ17: How waterproof/blood-proof is Firenock?
For 2009 or later Firenock lighted nock system, the circuits are UV cure epoxy-coated for waterproofing, however if the Firenock lighted nock is continuously submerged in water without a Hydro™ bow-fishing adaptor, its runtime will drop as water is discharging the battery.
GQ18: Can I shoot groups for practice?
Simply put, the answer is no. We highly discourage shooting groups. Though the Firenock integrated circuit (IC) can withstand a lot of force, there is a limitation to that resilience. The Firenock IC was designed, tested, and proved durable after several direct collisions with materials ranging from sand to concrete, handling 30'000 pounds per square inch at impact. But, all that aside, note that those collisions were indeed only of a "direct" nature. Because the tail end of an arrow will swing to expel excess energy after impact, multiple arrows shot near each other (like, for instance, in a group) can and often will "side slap" one other. And as the phrase suggests, an impact from the "side" is not what Firenock is designed and proven against. Such a hit will result in the IC being lifted off the circuit board and rending the Firenock circuit useless.
Of course, if such a hit and/or injury occurs to your Firenock before the warranty period of 30 days ends, send your broken Firenock circuit our way for a replacement.
GQ19: Can I use Firenock lighted nocks for bow-fishing?
See GQ17. As mentioned, to completely waterproof your Firenock, we recommend one of our two bow-fishing adapters to keep your Firenock lighted nock lit in brackish or salt water for weeks. Our Hydro™ BF is for standard 5/16" fiberglass arrows and specially designed to work with Firenock "S" nocks. For standard carbon bow-fishing arrows, Our Hydro™ BI has an internal diameter of about 0.244" - 0.246" and is specially designed to work with Firenock "S" nocks. The BI also has a pre-tapped hole to accept a slide stop.
GQ20: How often do I need to change my Firenock polycarbonate nocks?
Unlike any other lighted nock, you can easily field change the polycarbonate nock, circuit, and/or battery of our Firenock lighted nock system. It is recommended to replace a nock whenever it has passed through an animal to avoid breakage from scoring via bone (particularly during low temperatures i.e. under 4° F). For those who do not hunt, still replace your nocks every three to five years (dependent on use; being a clear, translucent nock, it is easy for UV light to degrade the plastic).
GQ21: What is so special about the target Firenock lighted nock system?
The Target (T) Firenock lighted nock system uses the same "G-Switch" technology as in the Hunting Firenock lighted nock, but will automatically turn off 17 seconds after activation instead of staying continuously lit. It is the only lighted nock system which is approved for use at ASA and IBO shoots. Why 17 seconds some might ask? 17 seconds is our "special" or perfect number because it allows you to see your arrow's flight from start to finish without it influencing your next shot (or helping your competitors' shots!). You can also use the Target lighted nocks during practice to refine your aim. Also, note that Target lighted nocks are the same weight as Hunting (H) and Intermittent (I) lighted nocks, so you do not need to re-tune your bow if you decide to exchange from one system for another within the same shaft.
GQ22: What is so special about the intermittent / blinking Firenock lighted nock system?
The Intermittent (I) Firenock lighted nock system "G-Switch" technology as in the Hunting Firenock lighted nock, but will stay lit for 6 seconds, and then blink until the battery runs out or is manually turned it off. Why should I buy a circuit that blinks instead of stays lit, one may ask. Well, put simply, you can see it better. When a light blinks, something called a "halo effect" occurs. Think of a flare. Its purpose is to create a pulse of light to, hopefully, catch someone's eye. Reduce the degree of a flare's effects and repeat it 30 times a minute and you have our Intermittent Firenock system. Best for ground-blind hunting. Also, note Intermittent lighted nocks are the same weight as Hunting (H) and Target (T) lighted nocks, so you do not need to re-tune your bow if you decide to exchange from one system for another within the same shaft.
GQ23: Did Firenock make a nock just like the Parker “Capture” nock?
Firenock does not make Parker Capture nock, as it is a nock made by Parker. However base on the string diameter of 0.145” and Internal diameter of a standard crossbow arrow of 0.300”', Firenock Q style nock not only will work but work better and safer. Firenock US patented clip and lock system, which the Q style nock features not just hug the string using a set of prongs like the “Capture” nock, Firenock Q clip onto the string and make dry fire due to string misalignment nearly impossible.
GQ24: Did Firenock make a nock just like the TenPoint “Omni” nock?
Firenock does not make TenPoint Omni nock, as it is a nock made by TenPoint. However based on the string diameter of 0.155” and Internal diameter of a standard crossbow arrow of 0.300”', Firenock J style nock not only will work but work better and safer. Firenock US patented clip and lock system, which the J style nock features not just hug the string using three sets of shallow prongs like the “Omni” nock, Firenock J clip onto the string and make dry fire due to string misalignment nearly impossible. For 2019, due to the more extreme string angle of the TenPoint, and some Horton crossbows, we have tested and proof that Firenock “J” style not only work well with most of the crossbows made by TenPoint, WickerRidge, Horton, Mission, Native, Killer Instant, that has 0.155” +/-0.005” serving. The only exception to this rule is the Mission 400 which after extensive testing we are convinced that only metal nock with a flat center and side lip work best.
GQ25: There's so many O-rings, are they interchangeable?
O-rings are NOT interchangeable. As it is easy to mix up O-rings, we recommend simply ordering O-rings according to your nock style. See this page for details on how to identify what O-rings you need.
GQ26: Can I use Firenock with FOB?
The answer is yes, Firenock "S" style lighted nocks can be used, but it will take some work as the FOB has a lip that goes right between the Nock neck and the shaft which causes FOB to not be able to be used with most lighted nocks. If you would like to modify your equipment to still use FOB with our Firenock lighted nock system, follow the steps below carefully.
- Shave off a tiny edge from the back of the shaft. A pencil sharpener will do the job. This is to create a groove between the nock and the shaft. After sharpening, it is recommended to use the Firenock APS to square the end.
- Drill the FOB lip hole with a 9/16" drill bit. If possible, we recommend the use of a drill press to remove as small an amount of material as possible as you are only trying to make a smaller lip for the FOB to ride onto (you don't want to completely remove the lip). You want about 0.055-0.065" of material left on the lip of the FOB.
- Install the Firenock into the arrow. Slide the modified FOB over the nock carefully. It will go over the Firenock and will now rest over that groove between the nock and the shaft. When shot into an animal, the FOB will move backwards and over the Firenock lighted nock without popping out and harming the Firenock (as it is proven to do without these modifications).
GQ27: Can I use Firenock with a weight tube?
Yes, however it must be installed before the end cap is installed.
BQ1: What are the three common battery models offered from Firenock and what are their differences?
We offer three common battery models (BR, BL, and BU) to provide options for different hunters who hunt in different conditions (i.e. different lighting and/or temperatures.) In general, BR, giving the brightest light, is our hunting season battery but has a shelf life of nine months. BL is our year round battery and has a shelf life of two years. Lastly, BU is our "back-up" battery with a shelf life of 7 years and dimmer brightness Please visit our webstore for more details.
BQ2: My lighted nock does not light up, what should I do?
Like all electronics, poor battery connection is the number one cause of failure. Follow the troubleshooting procedure below.
- Remove your Firenock lighted nock system.
- Exchange the current battery with one from another system that you know works.
- If that doesn't work, contact us here.
BQ3: Besides activating my Firenock, how can I check if my battery is good?
We recommend the use of a battery tester. Unlike a volt meter, which only shows the battery's voltage output, a battery tester shows the true remaining power within a battery. For Firenock batteries, even when they are 90% drained, the volt meter may still show that it is 3.0v. We recommend GB Instruments™ GBT-500A Battery Tester which can be purchased from Amazon and at most local hardware stores (ACE Hardware, Menards) for about US$10.00. To test a Firenock battery with this battery tester, set the dial to "LITHIUM 3V", place the red probe (positive) onto the shell of the battery and the black probe (negative) onto the pin of the battery.
BQ4: What's the best way to store Firenock batteries when I'm not using them?
Our BR battery only has about 8 to 12 months of shelf life. It is meant for one season of use, therefore there is no need to store and then re-use the BR battery. After one season, please remove the BR battery from your arrow shaft and Firenock circuit, otherwise the BR battery may leak and ruin the lighted nock system.
Our BL and BU batteries have 36-month and 84-month shelf lives respectively. Firenock lighted nocks, like all electronic devices, drain a small amount of power continuously from the battery when it is installed, even when not in use. Thus, if not removed, the battery will be completely drained within 9 to 12 months. We recommend removing and storing a BL or BU battery if it is not going to be used for 3 or more months in its original battery case and in a cool place (e.g. basement).
BQ5: I installed the long shelf life battery in my Firenock about a year ago and now the battery is dead. Do I have defective batteries?
When a Firenock battery is installed into a Firenock lighted nock system, some energy will always be in use due to monitoring (your Firenock lighted nock will be ready for activation at all times). In general, no matter what type of Firenock battery you use, the battery is only good for about a year if keep installed on the circuit. Thus it is recommended to remove the battery after each hunting season and put it back in the case for reuse (except for BR as it has up to 12 months shelf life).
BQ6: What is the O-ring on the battery-pin for?
Three tiny battery pin O-rings come standard with all Firenock battery packs. It is important for insulation and shock absorption. If you lost your O-rings, they are available here.
BQ7: Why does Firenock only use the 425 sized battery?
Though a 435 sized battery does last longer, it is about 50% heavier than the 425 sized battery. With the Firenock lighted nock system lasting at a minimum of three weeks with the use of the 425 sized battery, we found that there is no need to upset the FOC with the extra weight of the 435 sized battery.
Extreme Shock End Cap FAQ
EQ1: Do I have to install the ESEC into my arrow?
YES, absolutely. As of 2014, all Firenock lighted nocks come with and require an Extreme Shock End Cap no matter what speed you shoot. If you do not intentionally install the ESEC and cause the Firenock to break a second time, our warranty becomes void.
EQ2: How do I remove my ESEC?
In most cases, the ESEC will be permanently installed in your arrow. Due to its light weight, you might as well leave an end cap in a arrow See EQ5 for exact weights.
If your arrow was destroyed and you would like to recover your ESEC for use in another arrow, follow these instructions carefully.
- Crush the arrow with a lineman plier as close to the ESEC as possible so that it becomes small enough to submerge in an acetone bottle (we recommend the Nugene Flask Set.)
- Let sit acetone overnight or until you see that the ESEC has fallen loose from the remaining arrow shaft.
EQ3: My Firenock lighted nock system does not fit in the shaft after I installed the Extreme Shock End Cap (ESEC), why?
It may be due to:
Back pressure in the arrow shaft. Please remove the field point or broadhead to release the pressure.
Glue residue inside the shaft. Please clean the shaft and reinstall the end cap.
EQ4: I have the Extreme Shock Battery End Cap installed, how come my Firenock only lights some of the time?
There is a high possibility that the ESEC has not been installed at the proper depth. Follow these instructions for troubleshooting.
- Check to see if the ESEC is installed at the proper depth with the ESEC Installation Tool that comes standard in our ESEC packs. If it is at the proper depth, the installation tool should be screwed in flush with the back of your arrow.
- If the installation tool is not flush with your arrow and your ESEC is loose, then follow step 3-5. If it is not loose, see EQ2.
- Remove your field point so that the front of your arrow is open.
- Using a standard clothes hanger wire, push the ESEC out of the arrow shaft.
- Re-install your ESEC according to the installation manual or see here.
EQ5: How much weight does the Extreme Shock End Cap system add to my arrow?
Here is a list that ranks the ESEC system from lightest to heaviest.
"G" Style : ~0.75 grain
"A"/"E" Styles : ~1.75 grain
"Y" Style : ~1.5 grain
"S" Style : ~1.8 grain
"C"/"D"/"D2"/”D3”/"F"/"J"/"M"/"Q"/"U"/"V"/"Y" Styles : ~2.0 grain
EQ6: What do I do when I have an insert pre-installed that is not hollow?
Due to the tight seal that an ESEC and its O-ring creates at installation, it is crucial for there to be either no insert or a completely hollow insert installed to prevent any back pressure. Back pressure will push the glue around the curing O-ring and will ruin the system entirely. Fortunately, there are some medial measures that can be taken to relieve pressure for a successful ESEC installation.
Try to remove the insert without damaging your arrow.
If that is possible, drill a small through hole in the pre-installed insert. We recommend a #29 or 0.136” drill bit.
If that is not possible or acceptable, continue the standard installation procedure but with these precautions in mind.
Our ESEC installation tools have been updated over time with an air relief feature for this exact scenario. Check the end with the threads for a vertical slot to make sure that your tool has one. If not, take the next point even more to heart.
While pushing the tool into the shaft, make sure to go very slowly without any twisting motions. This, hopefully, will reduce pressure from building between the end cap and the insert. Good luck!
If you want to take a more direct, DIY approach, you will need to sacrifice a ball point pen. See the last few minutes of our ESEC installation video here for the steps