Why Players Get Turned Away at Chrono
It happens every weekend somewhere in Canada. Someone drives two hours, unpacks, gets to the chrono station, and reads over the limit. Game over before it started.
Almost always the cause is the same: they knew their gun's FPS number, but not what that number actually meant. This guide fixes that.
Note: this article covers field rules — what venues enforce so games stay safe. For the legal side of airsoft ownership in Canada, see our separate guide on whether airsoft is legal in Canada.
⚡ FPS Is a Misleading Number. Joules Is the Real One.
This is the single most important thing to understand, and most beginners get it wrong.
FPS (feet per second) measures speed. Joules measure energy. Energy is what actually determines how hard a BB hits you, and energy depends on both speed and BB weight.
A light BB travels fast but carries little energy. A heavy BB travels slower but carries the same or more. That means:
The same gun will give completely different FPS readings depending on which BB you chrono with.
Here is roughly what one gun at 1.49 J looks like across BB weights:
- 0.20g: around 400 FPS
- 0.25g: around 358 FPS
- 0.28g: around 338 FPS
- 0.30g: around 327 FPS
- 0.32g: around 316 FPS
Same gun. Same energy. Five very different numbers. This is why an FPS limit is meaningless unless the BB weight is stated — and why a well-run field will always say "400 FPS on 0.20g" rather than just "400 FPS."
It is also why Canadian fields are increasingly moving to joule limits instead. A joule limit cannot be gamed by swapping BB weights.
Quick reference: common joule limits
- 1.14 J — roughly 350 FPS on 0.20g. Common indoor CQB limit.
- 1.27 J — roughly 370 FPS on 0.20g. Used at some indoor arenas.
- 1.49 J — roughly 400 FPS on 0.20g. The most common outdoor "green class" limit in Canada.
- 2.23 J — roughly 490 FPS on 0.20g. Typically bolt-action snipers only, with a minimum engagement distance.
🚦 The Class System
Many Canadian fields, particularly in BC and Quebec, sort guns into colour classes rather than quoting raw numbers. The exact thresholds vary by field, but the structure is consistent:
- Green class — the standard limit, usually around 1.49 J. Full auto permitted. No minimum engagement distance beyond basic courtesy. Most players are here.
- Yellow class — higher energy, typically semi-auto only, with a minimum engagement distance attached. Some fields do not allow yellow class at all, particularly tight CQB fields.
- Red class — bolt-action only, highest energy, longest minimum engagement distance, often requiring a marksman certification or field approval.
Check the class rules of your specific field before you go. Two fields an hour apart can have completely different policies on the same gun.
📏 Minimum Engagement Distance (MED)
MED is the minimum distance at which you are allowed to shoot someone with a higher-powered gun. Inside that distance, you must call a "bang kill" instead of firing — you get close enough to be unmissable, say "bang," and the other player takes the hit.
Typical MEDs in Canada run from about 50 feet for yellow class up to 100 feet or more for bolt-action snipers. One field we verified enforces a 100-foot MED on anything in the 400–550 FPS sniper band.
MED exists because a high-energy BB at close range genuinely injures people. Fields take violations seriously, and getting ejected for shooting inside MED is one of the fastest ways to get a reputation you do not want.
🎯 What Canadian Fields Actually Enforce
From our verified field research across the country, here is the real range:
- Indoor CQB: generally the strictest — 1.14 J to 1.27 J, or 330–370 FPS on 0.20g. Some indoor fields also cap maximum BB weight (one caps at 0.25g) because heavier BBs at close range hurt more.
- Outdoor woodland: commonly 1.49 J / 400 FPS on 0.20g for AEGs and pistols.
- Bolt-action snipers: 400–550 FPS depending on the field, always with an MED, often semi or bolt only.
- Club fields: often green class only, with no yellow or red permitted at all.
See our province-by-province field list for the specific limits at fields near you — we note them per venue where they are published.
🔬 How Chrono Actually Works
At most Canadian fields the process is:
- You go to the chrono station before the first game.
- You shoot several rounds through a chronograph, usually with the field's own BBs at a known weight — this is why fields specify house BBs, so nobody can game the reading.
- They record your highest reading, not your average. A gun that averages 395 but spikes to 415 fails.
- You get a zip tie, wristband or tag indicating your class.
Why your reading might be higher than expected
- Temperature. Gas guns read significantly higher on a hot day and lower in the cold. A CO2 pistol that passes in May can fail in August. This works in reverse in winter — see our cold weather guide.
- A fresh spring. New springs shoot hot for the first few hundred rounds before settling.
- You chronoed at home on different BBs. The most common cause by far.
- Inconsistent air seal giving you spikes. If your readings jump around by more than about 10 FPS, something is wrong — our troubleshooting guide covers air seal diagnosis.
✅ How Not to Fail Chrono
- Know your field's limit and the BB weight it is quoted on before you leave the house. Not the number from the box your gun came in.
- Chrono at home on 0.20g if that is what your field uses, so there are no surprises.
- Leave yourself margin. If the limit is 400, build to about 380. Temperature swings and spring variation will eat the difference.
- Bring a lower-power spring or a spare gun if you are borderline and travelling far.
- Test in similar temperature to game day, especially with gas guns.
- Never try to sneak through. Fields chrono for a reason, staff have seen every trick, and getting caught means being asked to leave.
🧮 Doing the Math Yourself
If you want to convert between BB weights, the energy formula is:
Energy (joules) = ½ × mass (kg) × velocity² (m/s)
To convert FPS to m/s, divide by 3.281. So a 0.20g BB (0.0002 kg) at 400 FPS is about 122 m/s, giving roughly 1.49 J.
In practice, most players just use one of the many free joule calculators online — but understanding why the number moves is what keeps you out of trouble.
🎒 Gear That Passes Chrono
If you are consistently reading over your local limit, we can help — spring swaps are a routine job at our in-house repair service, and we can chrono a gun before you drive out to a field. District Airsoft ships Canada-wide with free shipping over $150.
Field limits change. Always confirm directly with the venue before you go. Last updated: August 2026.
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