Byrna Mission 4 Review: Powerful 38-Round Defense

Q: What is in the Byrna Mission 4 kit versus the bundle?

The base kit includes the launcher, two 88g CO2 cartridges, and a tactical ballistic nylon case — ammo sold separately. The bundle adds a Byrna-branded rifle bag, four 88g CO2 cylinders, and two 95-count jars of kinetic projectiles (roughly 190 rounds), so it is ready to shoot out of the box. Pricing varies by configuration and retailer.

Q: What CO2 does the Byrna Mission 4 use?

The Mission 4 is built around 88g CO2 cylinders — it will not function with the 12g cartridges used by the Byrna SD, LE, CL, CL-XL, or TCR. Byrna lists some configurations as 12g-capable, so confirm what your specific kit supports, but plan around the 88g system as the primary supply. Either way, it sits in a separate CO2 ecosystem from the rest of the lineup, and one 88g cylinder delivers up to 55 shots.

Q: How does the Byrna Mission 4 compare to the TCR?

Both are shoulder-fired rifle-platform launchers on different CO2 systems. The Mission 4 uses 88g cylinders for up to 55 shots and 38 rounds across two coupled mags. The TCR uses 12g cartridges for up to roughly 19 shots with a single 19-round magazine. The Mission 4 wins on capacity and range; the TCR wins on cost, weight, and CO2 flexibility.

Our Byrna Mission 4 review covers specs, the 88g CO₂ setup, real-world performance, and who this rifle-platform launcher is actually built for.

The Byrna Mission 4 sits at the top of Byrna‘s lineup and makes no apologies for it. This is a shoulder-fired, magazine-fed, CO₂-powered launcher originally engineered for law enforcement — and it shows in everything from the magnesium receiver to the 88g CO₂ system that delivers up to 55 shots per cylinder. If you have been browsing the full Byrna lineup and wondering what the ceiling looks like, this is it.

This Byrna Mission 4 review breaks down the specs, the CO₂ ecosystem, how it stacks up against the TCR, and — most importantly — who should actually spend the money on it versus who should step down a tier. Because the Mission 4 is a very specific tool for a very specific buyer. It is not a carry gun, not a vehicle gun, and not a replacement for the SD or LE in most situations.

⚡ Bottom Line Up Front

The Byrna Mission 4 is the right call if your use case is staged home defense — think bedside or dedicated safe-room positioning — where capacity, standoff distance, and shoulder-fired control matter more than portability. The base kit includes the launcher, two 88g CO₂ cartridges, and a ballistic nylon case; ammo is sold separately, so budget for projectiles. If you would rather start fully stocked, the Mission 4 Bundle adds a rifle bag, four 88g cylinders, and two 95-count jars of kinetic projectiles so you can shoot the day it arrives.

Byrna Mission 4 Review: Start Here

Best for Home Defense — Byrna Mission 4 Kit

38 rounds staged and ready, 325 FPS average, shoulder-fired stability. The highest-capacity less-lethal platform Byrna makes. Base kit: launcher, two 88g CO₂ cartridges, and a ballistic nylon case.

Best Ready-to-Run Package — Byrna Mission 4 Bundle

Everything in the kit plus a branded rifle bag, four 88g CO₂ cylinders, and two 95-count jars of kinetic projectiles. The day-one-ready option if you do not want to source ammo separately.

Best Value Rifle-Style Alternative — Byrna TCR

If the Mission 4 price is hard to swallow and you do not need the 88g CO₂ system, the TCR hits a similar silhouette on standard 12g cartridges at a lower cost.

ℹ️ How We Researched This

We cross-referenced Byrna‘s official product-page specs against authorized dealer listings, the current Amazon listings, owner forums, and independent review data. Where figures varied — particularly for effective range, where third-party listings sometimes cite 175 ft — we defaulted to Byrna‘s published figure of 100 ft and noted the discrepancy. Performance conclusions are drawn from consistent patterns of owner feedback and published manufacturer data. We did not conduct hands-on testing for this review.

Byrna Mission 4 vs TCR vs LE: At a Glance

Model	Platform	Avg FPS	Effective Range	Shots/CO₂	Magazine Cap.
Byrna Mission 4	Rifle (shoulder-fired)	~325 FPS	Up to 100 ft	Up to 55 (88g)	38 rounds (2×19)
Byrna TCR	Rifle (shoulder-fired)	~300 FPS	Up to 60 ft	Up to ~19 (12g)	19 rounds
Byrna LE	Pistol (handheld)	~330 FPS	Up to 60 ft	~17 (12g)	5 rounds

FPS and shot-count figures are sourced from Byrna‘s official product pages and are approximate, varying with temperature. Some third-party listings cite a 175 ft effective range for the Mission 4; we use Byrna‘s own published figure of 100 ft. Byrna also publishes target-based effective ranges (a smaller target means a shorter practical distance). TCR and LE figures are per Byrna‘s published specs.

➡️ Staged home defense with max capacity? → Byrna Mission 4. 38 rounds ready, rifle stability, 100 ft effective range.

➡️ Want a rifle-style launcher without the 88g CO₂ commitment? → Byrna TCR. Lighter, uses standard 12g cartridges, still shoulder-fired.

➡️ Need something you can carry, store in a vehicle, or use outside the home? → Byrna LE or Byrna SD. Compact, holsterable, built for mobility.

➡️ Prioritizing concealability above everything? → Byrna CL. The Mission 4 is anything but discreet.

Red Flags: Byrna Mission 4 Mistakes to Avoid

Buying it as a carry or EDC solution. The Mission 4 is under 32 inches long and weighs over 6 lbs loaded. This is a staged home-defense tool, not something you carry outside the home.
Assuming your 12g CO₂ cartridges will work in it. They will not. The Mission 4 is built around 88g CO₂ cylinders — a different supply chain from every other Byrna model. If you are already in the Byrna ecosystem with an SD or LE, your 12g stock is incompatible, so confirm what your specific Mission 4 configuration supports before stocking CO₂.
Buying without a staging plan. 38 rounds and a rifle platform are only advantages if the launcher is accessible and ready. Leaving it in a case on a high shelf defeats the purpose. Know where it lives and how quickly you can reach it.
Skipping ammo research. The Mission 4 works with both kinetic and chemical rounds, but what you load matters. Running kinetic in one magazine and pepper in the other — the two contrasting-color mags make this easy — is a strategy worth thinking through before you need it.
Forgetting temperature limits. CO₂ performance drops significantly in the cold. Byrna‘s published operating range is 20°F to 120°F. If your garage or safe room drops below freezing in winter, account for it.
Conflating it with the TCR. Both are rifle-style Byrna launchers, but they run on different CO₂ systems with different capacity ceilings. The decision is not just about price — it is about whether the 88g ecosystem and 38-round staging make sense for your setup.

What We Looked For

Evaluating a staged home-defense launcher is a different exercise from evaluating a carry pistol. The criteria shift toward capacity, reliability under stress, and ergonomics at the platform level.

Capacity and sustained fire. In a home-defense scenario, you want rounds in reserve without reloading under pressure. The Mission 4’s 38-round coupled-magazine setup — paired with a 55-shot CO₂ cylinder — is the most important spec on the sheet. We weighed whether that capacity advantage is real and meaningful next to the pistol-platform alternatives.

CO₂ delivery system. The 88g cylinder is central to what makes the Mission 4 different. We evaluated whether the on/off gas valve — which lets you conserve CO₂ between uses rather than losing pressure overnight — is as practical as Byrna advertises. Consistent owner feedback suggests it is, which matters for a staged weapon that may sit for weeks between uses.

Shoulder-fired stability and accuracy at range. A rifle platform is only worth the extra size if it translates to meaningfully better accuracy at distance. The Mission 4’s adjustable buttstock, foregrip, and flip-up sights need to deliver real control advantages over the pistol models at the ranges where home defense actually happens.

Build quality and materials. At this price point, a magnesium receiver and anodized aluminum components are expectations, not surprises. We examined whether the construction aligns with the premium positioning.

Round compatibility and flexibility. The Mission 4 fires all of Byrna‘s .68-caliber projectile types — kinetic, pepper, MAX, and training rounds. The dual contrasting-color magazine setup enables a mixed-load strategy that is genuinely useful, and we evaluated how practical that is in real staging scenarios.

Full Byrna Mission 4 Specs

Average FPS

~325 FPS (max 365 FPS) — per Byrna‘s published specs

Magazine Capacity

38 rounds — two coupled 19-round magazines

Shots Per CO₂

Up to 55 per 88g cylinder; varies with temperature

Effective Range

Up to 100 ft — per Byrna‘s official product page

Kinetic Energy

Up to 18.5 J (14.7 J average) — per Byrna‘s data

Weight (Loaded)

~6.13 lbs — per authorized dealer spec sheet

Caliber	.68 caliber
CO₂ Type	Built around 88g cylinders; some configurations 12g-capable — confirm your kit
Overall Length	Under 32 inches
Receiver	Durable magnesium
Rail System	AR-15-style M-LOK shroud, 4-sided Picatinny rails
Sights	Flip-up adjustable front and rear
Operating Temperature	20°F to 120°F
Operation	Fully pneumatic — no batteries or electronics
Safety	Ambidextrous push-button safety + two-position selector
Gas Valve	On/off slide valve — conserves CO₂ between sessions
Warranty	Byrna-listed 2-year limited manufacturer warranty
Permit / FFL	No FFL or background check required at the federal level; 18+; local rules can vary

ℹ️ The 88g CO₂ Ecosystem

The Mission 4’s 88g CO₂ system is a different ecosystem entirely from the rest of the Byrna lineup. For what to buy and how to manage it — including the on/off valve and cold-weather behavior — see our Byrna CO₂ guide. And for which rounds to load in each magazine, our Byrna ammo guide breaks down kinetic, pepper, MAX, and training rounds — especially relevant if you run a mixed-ammo setup.

The Mission 4 Kit vs Bundle: What’s Worth It

There are two main ways to buy the Mission 4 on Amazon, and the difference comes down to how stocked you want to be on day one.

Top Pick — Core Launcher

Byrna Mission 4 Kit

Best for: Home defenders who want the highest-capacity less-lethal platform Byrna makes, with the flexibility to choose their own ammo.

The base kit is the core launcher buy. You get the Mission 4 launcher with its CO₂ stock system, two 88g CO₂ cartridges to get started, and a tactical ballistic nylon case. The launcher itself carries the platform’s signature 38-round capacity across two coupled 19-round magazines. Ammo is sold separately here, so plan to add .68 projectiles before your first range session.

The CO₂ stock setup is worth understanding before you buy. The 88g cylinder threads into the stock via the integrated adapter — the stock itself physically houses the cylinder. An on/off slide valve lets you cut CO₂ flow when you are not actively using the launcher, so the cylinder does not bleed down overnight the way a constantly pressurized setup would. For a staged home-defense weapon that may sit for weeks at a time, this is meaningful, and owner reports consistently flag it as one of the more thoughtful design decisions on the platform.

✅ What Works

38 rounds staged with coupled mags — highest capacity in the Byrna lineup by a wide margin
88g on/off valve design keeps the cylinder viable for long-term staging
Shoulder-fired stability translates directly to accuracy at distance
Quad Picatinny rail makes optic and light additions genuinely practical
Magnesium receiver and aluminum hardware feel appropriately premium
No FFL or background check at the federal level; local rules can vary

⚠️ Worth Knowing

Over 6 lbs loaded and under 32 inches long — staging location matters, not grab-and-go
88g CO₂ is a separate supply chain from every other Byrna model
Ammo not included in the base kit — budget for projectiles
Temperature sensitivity is real; performance degrades below 20°F

Check the current Mission 4 Kit pricing on Amazon. View the Mission 4 Kit →

Ready-to-Run Upgrade

Byrna Mission 4 Bundle

Best for: Buyers who want the launcher staged, stocked, and ready to shoot without sourcing CO₂ and ammo separately.

The bundle is the day-one-ready option. Along with the Mission 4 rifle, it adds a Byrna-branded rifle bag, four 88g CO₂ cylinders (double the base kit), and two 95-count jars of Byrna kinetic projectiles — roughly 190 rounds to start training and staging immediately. If the base kit’s “ammo sold separately” line gives you pause, the bundle solves it in one purchase: you can stage the launcher and hit the range the day it arrives. The tradeoff is simply price — you are paying up front for the bag, extra CO₂, and the included ammo rather than buying them piecemeal.

Want it stocked and ready out of the box? Check the bundle. View the Mission 4 Bundle →

The rail system is a real Picatinny — a four-sided M-LOK shroud — and aftermarket accessory compatibility is broad. A light, a laser, and a red dot are all viable additions. Byrna also sells Mission 4-specific accessories through its lineup if you want to keep everything in the Byrna ecosystem; browse those in Byrna’s catalog.

Who the Byrna Mission 4 Is For — And Who Should Look Elsewhere

The Mission 4 is the right tool for a specific kind of home defender: someone who has thought seriously about where a threat encounter would actually happen, staged a dedicated defensive position, and decided that capacity and standoff distance matter more than portability. A 38-round rifle platform next to the bed or in a safe room is a genuinely different capability than any of Byrna‘s pistol models. If that is your use case — and you are committed to the 88g CO₂ ecosystem — this is one of the most capable less-lethal home-defense platforms civilians can buy.

But if you need something for outside the home — vehicle, travel, concealed carry, or general on-person use — the Mission 4 is the wrong answer, and no version of this platform changes that. Step down to the Byrna LE or Byrna SD for anything that requires mobility. If you want a rifle-style platform but the Mission 4’s price or 88g CO₂ system is a sticking point, the Byrna TCR is worth a serious look — it runs standard 12g cartridges and costs significantly less, though it gives up capacity and range in the trade. For a direct head-to-head, see our Mission 4 vs TCR comparison. For the broader picture, our non-lethal launcher guide shows where either fits.

⚠️ Legal Note

The Byrna Mission 4 is not classified as a firearm under federal law and does not require a background check, FFL transfer, or permit to purchase or own; you must be 18 or older. State and local laws regarding less-lethal weapons — their carry and their use in self-defense situations — vary. Always confirm local ordinances before purchasing or deploying any less-lethal device. For state-by-state context, see our Byrna legality guide. This is not legal advice.

Frequently Asked Questions: Byrna Mission 4

How does the Byrna Mission 4 perform for real-world home defense?

Consistent owner feedback points to the Mission 4 performing as its specs suggest — shoulder-fired stability, meaningful accuracy at range, and a CO₂ system that holds up well for staged, long-term storage. The on/off gas valve is frequently cited as a practical feature the pistol-platform models do not offer. The main caveat across owner reports is temperature: in cold environments, CO₂ performance drops noticeably, which matters for anyone staging this in a garage or unheated space.

How many rounds does the Byrna Mission 4 hold?

The Mission 4 uses two 19-round magazines coupled together, giving you 38 rounds ready on the launcher. When one magazine runs dry, you flip the coupled pair and load the second — no separate magazine to locate or insert. Additional 19-round magazines are available through Byrna if you want to stage extras.

How many shots does the Mission 4 get per 88g CO₂ cylinder?

Per Byrna‘s published specs, the Mission 4 fires up to 55 shots from a single 88g cylinder — enough to cover nearly three full 19-round magazines. Shot count varies with temperature; colder conditions reduce output. The on/off gas valve lets you conserve CO₂ between sessions, so you are not bleeding pressure when the launcher is staged and not in active use.

What is in the Byrna Mission 4 kit versus the bundle?

The base kit includes the launcher, two 88g CO₂ cartridges, and a tactical ballistic nylon case — ammo sold separately. The bundle adds a Byrna-branded rifle bag, four 88g CO₂ cylinders, and two 95-count jars of kinetic projectiles (roughly 190 rounds), so it is ready to shoot out of the box. Pricing varies by configuration and retailer, so check current listings before ordering.

What CO₂ does the Byrna Mission 4 use?

The Mission 4 is built around 88g CO₂ cylinders — it will not function with the 12g cartridges used by the Byrna SD, LE, CL, CL-XL, or TCR. Byrna lists some configurations as 12g-capable, so confirm what your specific kit supports, but plan around the 88g system as the primary supply for this platform. Either way, it sits in a separate CO₂ ecosystem from the rest of the lineup, and one 88g cylinder delivers up to 55 shots.

What is the Byrna Mission 4 FPS?

Per Byrna‘s official specs, the Mission 4 delivers an average of about 325 FPS, with a maximum of 365 FPS, firing .68-caliber projectiles. Average kinetic energy is around 14.7 joules, with a maximum near 18.5 joules. Some third-party sources cite different ranges, but we default to Byrna‘s own published numbers.

How does the Byrna Mission 4 compare to the TCR?

Both are shoulder-fired rifle-platform launchers, but they run on fundamentally different CO₂ systems. The Mission 4 uses 88g cylinders for up to 55 shots and 38 rounds across two coupled mags. The TCR uses standard 12g cartridges for up to roughly 19 shots per cartridge with a single 19-round magazine. The Mission 4 wins on capacity and range; the TCR wins on cost, weight, and CO₂ flexibility. For a full side-by-side, see our Mission 4 vs TCR comparison.

What accessories are compatible with the Byrna Mission 4?

The AR-15-style M-LOK shroud with four-sided Picatinny rails makes it broadly compatible with standard optics, weapon lights, laser sights, and bipods. Byrna also offers Mission 4-specific accessories, including extra magazines and CO₂ cylinders. Integrated sling mounts support standard sling configurations. Adding a red dot and a light is the most common owner upgrade.

Is the Byrna Mission 4 worth it for home defense?

For a staged home-defense application where you have already decided less-lethal is the right call, yes — the Byrna Mission 4 for home defense is hard to beat in a stationary role. The 38-round capacity, 100-foot effective range, shoulder-fired stability, and 88g on/off valve system make it stand out for staged use. The price premium is real, but so is the capability gap over the pistol-platform models. If your use case is carry, vehicle defense, or anything requiring mobility, the Mission 4 is not the right tool regardless of budget.

Do I need a background check or FFL to buy the Byrna Mission 4?

No FFL or background check is required at the federal level. The Mission 4 is not classified as a firearm under federal law, and there is no waiting period to purchase. You must be 18 or older. State and local laws on less-lethal devices vary — always verify local ordinances before purchasing. See our Byrna legality guide for state-by-state context.

Final Verdict: Is the Byrna Mission 4 Worth It?

The Byrna Mission 4 earns its premium positioning — but only if you are the buyer it is actually designed for. As a staged home-defense platform, it is hard to beat in the less-lethal category: 38 rounds ready to go, a 100-foot effective range, shoulder-fired stability a pistol grip cannot replicate, and an 88g CO₂ system with an on/off valve that makes long-term staging genuinely practical. If you have committed to less-lethal as your primary home-defense layer and you are thinking in terms of a dedicated position rather than a portable weapon, the Mission 4 is the right call.

The case against it is straightforward: it is expensive, it is large, it runs on a CO₂ system that does not overlap with any other Byrna platform, and it is overkill for anyone who needs mobility. If you are on the fence about size and price, our Byrna TCR review covers the shoulder-fired platform at a lower cost with a more flexible CO₂ supply chain — and our Mission 4 vs TCR comparison breaks down exactly where each one wins. If you need something you can actually carry, read our Byrna SD review; the SD and LE are the ones to look at. And if you are still figuring out where the Byrna lineup fits into your broader strategy, our complete Byrna guide covers the full picture.

When you are ready to buy, the Mission 4 Kit is the core launcher purchase, while the Bundle gets you staged and stocked out of the box. Stock can come and go on a flagship platform like this, so if you find your preferred configuration available, it is worth grabbing while it is in stock.