Airsoft has its own language, and walking onto a field cold means half the briefing sounds like static. This glossary collects the terms you’ll actually hear — muzzle velocity, gun types, safety calls, carry gear — and, where it helps, links each one to the real zlangsports.com product it relates to. Bookmark it as your field-day reference; pair it with the starter-kit checklist and the safety & rules guide if you’re new.
Shooting & performance
- FPS (Feet Per Second)
- Muzzle velocity — how fast a BB leaves the barrel, measured with a chronograph. Fields set FPS limits by weapon class; exceed it and you don’t play that gun. See the safety & rules guide for typical brackets.
- Joule
- The energy a BB carries, derived from FPS and BB weight. Some fields (especially in Europe) cap guns by joule rather than FPS, because joules account for BB mass — a heavy BB at the same FPS hits harder.
- AEG (Automatic Electric Gun)
- A battery-powered airsoft gun with a motor and gearbox. The most common type for beginners: reliable, easy to maintain, no gas to manage. (zlangsports.com focuses on the protective and carry gear around the gun, not the guns themselves.)
- GBB (Gas Blowback)
- A gun powered by green gas or CO₂ that cycles a realistic slide/bolt with each shot. Great feel, more maintenance, temperature-sensitive. Holster and carry gear like the ZL-KCB QLS kit are built around GBB pistols.
- HPA (High Pressure Air)
- A gun powered by an external air tank through a regulator. Consistent and tunable, popular in speedsoft and high-end setups. Usually needs a rig to carry the tank.
- BB
- The 6 mm (or 8 mm) plastic pellet you actually fire. Weight is measured in grams (0.20g, 0.25g, 0.28g…); heavier BBs fly flatter at range but need more energy.
- Hop-up
- A rubber nub that puts backspin on the BB, extending range and flattening trajectory. Adjusting hop-up is the first tuning step every player learns.
- ROF (Rate of Fire)
- How many BBs a gun fires per second/minute. Fun, but ammo discipline matters more than raw ROF in most games.
- DMR (Designated Marksman Rifle)
- A upgraded rifle built for mid-range precision — usually semi-auto only and held to a higher FPS limit than standard rifles, with a longer MED.
- Sniper / Bolt-action
- A spring or gas rifle built for long-range single shots, with the longest MED on the field. Rewarding but unforgiving.
- Spring gun
- A gun you manually cock each shot. Cheap, reliable, no battery or gas — common for pistols and starter rifles.
Safety & field rules
- MED (Minimum Engagement Distance)
- The closest range you’re allowed to shoot another player, set so even a hot gun can’t sting point-blank. Break it and you use the bang rule instead of firing. Covered in the rules guide.
- Chrono (chronograph)
- The pre-game check where a ref fires your gun through a speed meter to confirm FPS is under the field limit. You can sanity-check velocities at home first with a reusable ZL-S-TARGET setup.
- Barrel sock / safety plug
- A muzzle cover worn in any safe zone so a gun can’t accidentally fire. Guns are treated as loaded the entire time you’re on site.
- Full-seal
- Eye protection with no side gaps, so a glancing BB can’t slip past the frame. Non-negotiable on every field — purpose-built airsoft/paintball goggles like the ZL-633 or the ZL-656 combo meet this.
- Hit call
- Calling yourself out loud (“Hit!”) the moment a BB strikes you, then walking to respawn. Airsoft runs on the honor system — honest hit-calling is the sport’s foundation.
- Bang rule
- When you’re inside MED with a clear angle on an unaware opponent, you say “Bang!” instead of firing. It resolves close-range encounters without a unsafe shot. See the rules guide.
- Richochet
- A BB bouncing off a hard surface. Why you keep goggles on and never aim at bare rock or metal at close range.
- Safe zone
- Any area where guns are handled but not fired — staging, parking, breaks. Barrel socks on, mags out, goggles can come off only here.
Eye & face protection
Protective gear is where zlangsports.com’s catalog lives, so these terms link straight to products.
- Goggles
- Sealed eye protection. The ZL-633 is the wraparound entry pair; the ZL-656 bundles goggles with a lower mask.
- Mask
- Lower- or full-face coverage. The breathable ZL1 half-face mask covers mouth/jaw; the ZL11 seals eyes and face together; the ZL13 adds a mesh skull guard with style.
- Mesh guard
- A metal mesh panel over the mouth/nose — vents freely while stopping BBs. Found on the ZL13.
- Anti-fog
- A lens coating or treatment that slows fogging from breath and exertion. Covered in our anti-fog guide; the ZL-633 uses a fog-resistant polycarbonate lens.
- ANSI Z87.1 / EN 166
- Impact-protection standards (US / EU). The marking tells you a lens was tested against projectile impact. Look for it when buying eye pro — see the ANSI/CE safety explainer for what the markings mean.
Carry & load-bearing
- Rig / Plate carrier
- The vest that holds mags, plates, and pouches. Comfort matters on long games — the ZL-BXB-2CM 2 cm pad sits between you and the carrier to stop rubbing.
- Drop-leg
- A thigh-mounted platform for a holster or pouch, keeping a sidearm clear of the belt and carrier. The ZL-KCYD is the universal QLS 19/22 thigh strap.
- QLS (Quick Locking System)
- Safariland’s fork-and-receiver quick-release standard (QLS 19 fork + QLS 22 receiver) that lets you snap a holster on and off a platform in a second. The ZL-KCB kit is the QLS adapter for 1911 / Glock 17 / P226 / SIG / USP.
- Holster
- The device that holds your sidearm. Most airsoft holsters use the QLS footprint so you can swap them across rigs and drop-legs.
- Adapter base (short / long)
- The mount that drops a QLS holster to your preferred height. The short base rides low and tight to the belt; the ZL-XCYB long base extends the drop for clearance over a bulky carrier. Compare them in our short-vs-long guide.
Game types & accessories
- Tracer
- A mock suppressor with LEDs that makes glowing BBs visible in flight, so you can see your shot path — especially at night. The ZL-EGW01 is the green-tracer unit; the ZL-EGW09-SL is the RGB version you can switch colors on. See the tracer explained guide.
- RGB tracer
- A tracer that cycles multiple colors (not just green), so you can match your glow to a team or mood. The ZL-EGW09-SL RGB tracer is the one to look at.
- Target
- A backstop you shoot to train. The reusable ZL-S-TARGET lets you drill at home for free after purchase.
- Headgear
- A breathable head wrap that manages sweat and keeps goggles from sliding — the ZL-H04 is the budget pick.
- Pad
- Comfort padding for a carrier or rig — the ZL-BXB-2CM stops plate-rub on long games.
- MilSim (Military Simulation)
- Long scenario games with roles, objectives, and story. Demands endurance and roleplay discipline over raw speed.
- TDM (Team Deathmatch)
- The simplest format: eliminate the other team, highest kills or last team standing wins.
- CTF (Capture the Flag)
- Grab the enemy flag and bring it to your base. Rewards flanking and coordination.
- Respawn
- Where eliminated players return to play, after a set time or a “medic” revive. Know your respawn point before the game starts.
- Zeroing
- Adjusting sights or a tracer so shots land where you aim at a chosen distance. Our night-zeroing guide walks through it with a tracer.
Know the words, play the game.
Shop the gear behind the glossary at zlangsports.com →
Frequently asked questions
Which five terms should a total beginner learn first?
FPS, MED, chrono, full-seal, and hit call. Those five decide whether you can safely step on a field: FPS is the speed limit your gun must pass, MED is the closest you may shoot, chrono is the check that enforces it, full-seal is the eye protection you must wear, and hit call is how the game stays honest. Everything else is gear vocabulary you pick up as you build your kit.
What’s the difference between AEG, GBB, and HPA?
An AEG runs on a battery and gearbox — reliable and beginner-friendly. A GBB uses green gas or CO₂ and cycles a realistic slide, giving great feel but more upkeep. An HPA uses an external air tank through a regulator for consistent, tunable performance. Holster and carry gear such as the ZL-KCB QLS kit are built around sidearms regardless of type.
Do I need a tracer unit to play?
No — a tracer is a training and night-play accessory, not safety gear. It makes glowing BBs visible so you can see your shot path. The ZL-EGW01 (green) and ZL-EGW09-SL (RGB) are the units to look at if you want one, but eye and face protection come first.
What does QLS mean for a holster?
QLS (Quick Locking System) is a fork-and-receiver quick-release standard. A QLS fork on your holster snaps into a QLS receiver on your rig or drop-leg, so you can move one holster across platforms in a second. The ZL-KCB is the QLS adapter kit; the ZL-KCYD is the drop-leg that carries it.
Why do goggles need an ANSI Z87.1 or EN 166 marking?
Those are impact-protection standards (US and EU). The marking means the lens was tested against projectile impact, not just scratches — the difference between eye pro and a fashion frame. Look for the marking when buying; our ANSI/CE explainer breaks down what each label means.
