Shopping for a BB gun gets confusing fast, because “BB gun” gets used for four different things: steel-BB airguns, lead-pellet airguns, 6mm plastic airsoft, and gel blasters. They’re not the same, they don’t do the same jobs, and buying the wrong one is the most common mistake in this category. This guide sorts out what’s what, explains why BBs and pellets behave so differently, and covers what each type is actually good for.
The short version
A BB gun shoots round steel BBs, usually .177 caliber. Fast, cheap to feed, often built as a realistic replica.
A pellet gun shoots lead diabolo pellets. Slower to load, considerably more accurate, more energy on target.
Most dedicated BB guns use smoothbore barrels, while precision-oriented pellet guns typically use rifled barrels. There are exceptions — including dual-ammo guns that fire both — so projectile type and barrel type don’t divide the category perfectly.
On this page
How we researched this
This guide draws on manufacturer specifications, airgun industry sources, and consistent owner feedback. Velocity and energy figures are manufacturer-rated and vary with ammunition weight, temperature, and the individual gun.
We haven’t chronographed these ourselves. Verify current specifications before purchasing, and check your state and local rules — airgun law varies more than most people expect.
Four Things People Call BB Guns
Start here, because half the confusion in this category is people comparing products that aren’t in the same category at all.
| Type | Projectile | Typical Use |
|---|---|---|
| BB gun | .177 steel sphere | Plinking, training drills, high-volume shooting |
| Pellet gun | Lead diabolo, .177–.25 | Precision targets, pest control, small game |
| Airsoft | 6mm plastic | Games, force-on-force, team play |
| Gel blaster | Hydrated polymer beads | Backyard recreation, youngest shooters |
The important line is between the first two and the last two. BB and pellet guns fire hard projectiles at velocities that can cause serious injury. Airsoft and gel blasters are designed to be shot at people wearing protective equipment; BB and pellet guns emphatically are not.
If you’re looking at airsoft specifically, our airsoft guns guide covers that whole category — how velocity limits, BB weight, and the two protection standards fit together — and our guide to the best airsoft pistols covers sidearms specifically. Gel blasters are covered separately.
“BB” doesn’t stand for ball bearing
Nearly everyone believes it does. It doesn’t.
The name comes from BB-size lead shotgun shot, nominally around .180 inches. Around 1900, Daisy standardized its air rifle bore to .175 inches and marketed the ammunition as “air rifle shot” — but the BB designation had already caught on and never left.
Modern steel BBs measure roughly .171 to .173 inches, deliberately undersized. That detail matters more than it sounds, and we’ll come back to it.
BB vs Pellet: The Real Difference
This is the question the whole category turns on, and the answer is more interesting than “pellets are better.”
Shape and Barrel
A BB is a steel sphere. Nothing about its shape stabilizes it in flight beyond its own momentum.
A pellet is a diabolo — a narrow waist with a flared skirt, shaped a bit like a badminton shuttlecock. That shape does two things: the forward weight bias keeps the nose pointed into the airflow, and the skirt creates drag that stabilizes the tail.
Dedicated BB guns usually use smoothbore barrels; precision pellet guns typically use rifled ones. But the categories overlap — dual-ammo guns exist, and a rifled barrel doesn’t automatically mean better BB performance.
Why BBs Are Deliberately Undersized
Here’s the detail that explains everything else.
Steel BBs are slightly smaller than the bore — around .171 to .173 in a .177 barrel. That’s intentional: undersized BBs feed reliably through magazines and don’t create excessive friction against steel.
But it means the BB doesn’t seal the bore, so propellant gas escapes around it, and it doesn’t meaningfully engage rifling even in a rifled barrel. A properly sized pellet seals the bore, and in a rifled pellet gun it also engages the rifling and spins.
That one design choice is why BB guns feed fast and shoot cheap, and why pellet guns shoot accurately.
| BB | Pellet | |
|---|---|---|
| Material | Steel | Lead or lead-free alloy |
| Shape | Sphere | Diabolo — waisted with skirt |
| Barrel | Usually smoothbore | Usually rifled |
| Calibers | .177 (4.5mm) | .177, .20, .22, .25 |
| Typical velocity | Around 350–600 FPS | 600 to 1,200+ FPS |
| Accuracy | Adequate at short range | Considerably better, longer range |
| Ricochet risk | Higher — steel resists deforming | Lower — lead deforms more readily |
| Ammo cost | Very low | Higher, still cheap |
The Ricochet Point Deserves Emphasis
Steel BBs bounce. They don’t deform meaningfully on impact with hard surfaces, which means they come back — off metal, off concrete, off anything that isn’t a proper backstop.
Lead pellets generally deform more readily on impact, while steel BBs are particularly prone to ricochet from hard surfaces. Both still require a proper backstop.
Anyone who’s shot BBs at a metal target has felt one come back. It’s a genuine hazard, not a theoretical one.
Which Should You Buy?
Match the Type to the Job
Plinking cans in the backyard? BB gun. Cheap, fast, and accuracy beyond 30 feet isn’t the point.
Practicing trigger control and grip? BB gun, specifically a licensed replica of a pistol you own.
Target shooting for accuracy? Pellet, and a rifled barrel.
Pest control around a property? Pellet rifle — see the caliber discussion below, and check your local rules.
Small game hunting where legal? Pellet rifle, and verify your state’s requirements first.
Teaching a young shooter fundamentals? Either, with adult supervision and a proper backstop — see the safety section.
Power Systems
How the gun generates pressure affects everything about how it shoots.
Spring piston uses a cocked spring driving a piston. No consumables, consistent in cold weather, single-shot. Break-barrel rifles are the classic example. The tradeoff is a distinctive recoil pulse that takes getting used to.
CO2 uses a 12-gram cartridge. Semi-auto or full-auto operation, blowback slides on some replica pistols, very convenient. Two tradeoffs: performance drops in cold weather as CO2 pressure falls, and you’re buying cartridges.
Multi-pump pneumatic lets you pump the gun by hand — usually three to ten strokes — and the number of pumps determines velocity. No consumables, adjustable power, but it’s slow between shots.
PCP uses a pre-charged air reservoir filled from a tank or pump. The most powerful and consistent option, and the most expensive to get into.
Cold weather is the CO2 tradeoff nobody mentions
CO2 pressure is temperature dependent. A pistol that shoots 400 FPS in summer will shoot noticeably slower on a cold morning, and in genuinely cold conditions it may cycle unreliably.
If you shoot year-round in a cold climate, spring piston or multi-pump avoids that problem entirely.
Replicas and Training Use
Replica air pistols have a legitimate training use beyond novelty.
Licensed replicas — officially authorized copies of Glock, Sig, Smith & Wesson, Beretta and others — replicate the appearance, dimensions, and external layout of the real pistol.
Not every replica works the same way — check before you buy
This is the shopping mistake to avoid. Some licensed replicas include blowback slides that cycle when fired and drop-free magazines that load like the real thing. Others don’t.
The Umarex Glock 19 Gen3 shown here matches the G19’s general size, grip angle, sight picture, and external layout — but its slide is fixed rather than blowback, and it feeds from a 16-round stick magazine rather than a full-size replica mag. Manufacturer-rated to around 410 FPS on 12g CO2.
That doesn’t make it a bad gun. It makes it a different gun. If slide movement and a realistic loading experience matter to your training, look specifically for a blowback model — and read the specification rather than assuming licensing implies function.
What a Replica Is Actually Good For
Trigger time at a fraction of the cost. Centerfire ammunition is expensive and range time takes a trip. BBs cost almost nothing, and a replica pistol works in a garage with a proper trap.
Grip, presentation, and sight alignment. The fundamentals that don’t require live fire are exactly what a matched replica reinforces. If you carry a Glock 19, practicing draw-to-sight-picture with a Glock 19 replica builds the right motor pattern — and a fixed-slide model handles that job perfectly well.
Introducing a new shooter. Someone nervous about recoil and muzzle blast can learn stance, grip, and trigger press without either.
Be honest about what it doesn’t teach
A BB replica doesn’t reproduce recoil, muzzle blast, or the timing of a real reset. Blowback models help with the last one, but they aren’t the same, and they can’t be.
Use replica practice for fundamentals and repetitions — then confirm at the range. Our roundup of indoor ranges and our concealed carry guide cover the live-fire side.
Realistic replicas carry real risk
A licensed replica looks like the firearm it copies — that’s the point, and it’s also the hazard. Treat it with the same discretion you’d give the real thing.
Don’t carry it openly, don’t display it in public, don’t point it at anyone, and be aware that responding officers cannot tell the difference. Several states and cities regulate realistic imitation firearms specifically, including markings and transport requirements.
Pellet Rifles and Pest Control
The other end of the category, and a genuinely different product.
A break-barrel pellet rifle like the Gamo Varmint delivers velocities and energy that put it in a different class than any BB pistol — enough for effective pest control at practical distances, with the accuracy to place shots precisely.
Accuracy is the whole argument. Rifling plus a stabilized projectile means groups a BB gun can’t approach. That matters for pest control specifically, because a humane result requires precise placement rather than raw power.
Caliber Choices
.177 is the most common, cheapest to feed, and flattest shooting. It’s the ISSF specification for Olympic air pistol, which tells you something about its precision potential.
.22 is a popular airgun caliber when more projectile mass and energy are desired — heavier projectile, typically more energy at comparable airgun power levels.
.25 steps up again in projectile mass, at the cost of a more curved trajectory and pricier ammunition.
The appropriate choice for pest control depends on the species, the distance, the gun’s actual energy, and local law — not on a caliber number alone. Somebody shooting starlings at fifteen yards and somebody dealing with larger pests at forty are solving different problems.
Check your local rules first
Airgun regulation varies enormously. Some states treat airguns essentially as firearms, some regulate above certain velocities or calibers, and many cities prohibit discharge within limits entirely regardless of what the gun is.
Hunting with an airgun is separately regulated — legal species, minimum calibers, and seasons vary by state. Verify before you shoot, not after.
Guns That Shoot Both
Some airguns handle both projectiles, and for a first gun that flexibility is worth real money.
The Crosman 760 Pumpmaster is the classic example — a multi-pump pneumatic that feeds BBs from a magazine for fast plinking or single-loads .177 pellets when you want more accuracy.
It’s also a good illustration of why the smoothbore-versus-rifled shorthand isn’t absolute: Crosman specifies a smoothbore barrel on the 760, which is what lets it handle steel BBs comfortably. You get the versatility; you don’t get rifling-induced spin on the pellets.
The multi-pump system means you control the power — fewer pumps for close-range plinking, more for distance. No CO2 to buy, no cold-weather performance drop.
It’s a genuinely good teaching platform too. The pumping requirement builds a natural pause between shots, which slows a new shooter down in a useful way.
A kit version bundles it with a scope and ammunition if you’d rather not source those separately.
Check the Crosman 760 Pumpmaster on Amazon →
These Aren’t Toys
The single most important section on this page.
Airguns cause serious injuries every year
BB and pellet guns can cause permanent eye injury, penetrating wounds, and in documented cases death. The velocities involved are entirely sufficient to break skin, penetrate an eye, and damage internal structures.
Treat every airgun with the same handling rules you’d apply to a firearm: muzzle discipline, finger off the trigger, know your target and what’s behind it, and assume it’s loaded.
Three hazards specific to this category:
Ricochet. Steel BBs bounce off hard surfaces and come back. Use a purpose-built trap or a backstop you’ve tested, not a fence, a wall, or a piece of scrap metal.
Eye protection, always. This is the injury that ends badly, and it’s the one that’s entirely preventable. Everyone in the area, not just the shooter.
Realistic appearance. Replica airguns have been mistaken for firearms with serious consequences. Keep them cased in public, never brandish one, and make sure young shooters understand this completely.
A backstop is not optional
The cheapest way to make airgun shooting safe is a proper trap — a purpose-built steel or self-healing target designed to capture projectiles rather than send them back.
Our guide to shooting targets covers what works.
Legal Considerations
Airgun law is less uniform than firearm law, which surprises people.
Federal law generally doesn’t treat airguns as firearms, since the federal definition centers on expelling a projectile by explosive action. That means no federal background check for most airguns.
New Jersey shows why you check state law
New Jersey is the example worth knowing: state law treats qualifying air guns as firearms, even though federal law generally does not. The state’s own wildlife materials tell users exactly that.
Get that distinction wrong and conduct that would be lawful elsewhere can potentially create serious firearms-law problems under New Jersey law. Other states set their own thresholds by velocity or caliber.
Local rules add another layer. Many cities prohibit discharge within limits entirely regardless of what the gun is. Some states regulate sales to minors. And several jurisdictions have specific rules about realistic imitation firearms — markings, transport, and public display.
Hunting is separately regulated. If pest control or small game is your purpose, check your state wildlife agency for legal species, minimum caliber requirements, and season dates.
This is general information, not legal advice. Verify your own rules before buying.
Frequently Asked Questions
What’s the difference between a BB gun and a pellet gun?
BBs are round steel projectiles, usually .177. Pellets are lead diabolo-shaped projectiles designed to be stabilized in flight. Most dedicated BB guns use smoothbore barrels while precision pellet guns typically use rifled ones — though dual-ammo guns exist that blur the line. Pellets are considerably more accurate and carry more energy; BBs are cheaper, feed faster, and suit high-volume plinking.
Does BB stand for ball bearing?
No — that’s the most common misconception in the category. It comes from BB-size lead shotgun shot, around .180 inches. Daisy standardized to a .175-inch bore around 1900 and called the ammunition “air rifle shot,” but the BB name had already stuck.
Why are BBs less accurate than pellets?
Steel BBs are deliberately undersized — roughly .171 to .173 in a .177 bore — so they feed reliably and don’t scour the barrel. That means they don’t seal the bore or meaningfully engage rifling, so gas escapes around them and nothing stabilizes them in flight. A properly sized pellet seals, and in a rifled gun it also spins.
Do all Glock BB guns have blowback slides?
No, and this catches people out. Licensing means the replica is authorized to copy the appearance and external layout — it doesn’t guarantee blowback operation or a drop-free magazine. The Umarex Glock 19 Gen3, for instance, has a fixed metal slide and a stick magazine. Read the specification rather than assuming, especially if slide movement matters for your training.
Are BB guns dangerous?
Yes. They can cause permanent eye injury, penetrating wounds, and in documented cases death. Velocities are sufficient to break skin and damage internal structures. Handle them with the same rules you’d apply to a firearm, always use eye protection, and use a proper backstop — steel BBs are particularly prone to ricochet from hard surfaces.
Can a BB gun be used for training?
For fundamentals, yes — grip, stance, sight alignment, trigger press, and draw repetitions. A licensed replica of a pistol you actually own reinforces the correct manual of arms at a fraction of ammunition cost. What it can’t reproduce is recoil, muzzle blast, or real reset timing, so treat it as a supplement to live fire rather than a replacement.
What caliber pellet gun should I get for pest control?
It depends on the species, the distance, the gun’s actual energy, and your local law — not on a caliber number alone. The .177 is cheaper and flatter shooting, .22 offers more projectile mass and typically more energy at comparable power levels, and .25 more still with a curved trajectory. Check your state’s rules first, since airgun hunting is separately regulated with caliber minimums in some places.
Do CO2 guns work in cold weather?
Less well. CO2 pressure drops as temperature falls, so velocity decreases and in genuinely cold conditions the gun may cycle unreliably. If you shoot year-round in a cold climate, spring piston or multi-pump pneumatic avoids the problem entirely.
Is airsoft the same as a BB gun?
No. Airsoft fires 6mm plastic projectiles and is designed for games where participants shoot at one another while wearing appropriate protective equipment. BB guns fire steel projectiles at velocities that cause injury and should never be aimed at a person. Different products, different purposes — our airsoft guns guide covers that side, including the protective standards that make player-versus-player play possible.
Are BB guns legal?
Federal law generally doesn’t classify airguns as firearms, so no background check applies in most cases. But state law varies considerably — New Jersey treats qualifying air guns as firearms, for example, and other states set thresholds by velocity or caliber. Many cities prohibit discharge within limits, and several jurisdictions regulate realistic imitation firearms specifically. Check your local rules.
What’s a good first airgun?
A multi-pump like the Crosman 760 Pumpmaster is hard to beat — it shoots both BBs and pellets, needs no consumables, lets you control power by pump count, and the pumping cycle naturally slows a new shooter down. If replica training is the goal instead, a licensed CO2 pistol matching a firearm you own makes more sense.
The Bottom Line
Pick based on what you’re actually doing.
Plinking and volume shooting — a BB gun. Cheap ammunition, fast follow-ups, and accuracy past 30 feet isn’t the point.
Training repetitions — a licensed replica of a pistol you own, checking the specification for blowback if slide movement matters to you.
Accuracy or pest control — a pellet rifle, with caliber chosen for your actual situation.
Not sure yet — a dual-capable multi-pump like the 760 Pumpmaster covers both without committing.
Whatever you choose: proper handling, eye protection, and a real backstop substantially reduce the risks. These aren’t toys, and treating them like firearms is the right default.
Continue Your Research
Authority reference: for airgun safety guidance and education resources, see the National Shooting Sports Foundation’s safety materials. Airgun handling rules mirror firearm handling rules, and the same fundamentals apply.
Safety note: BB and pellet guns are not toys. They can cause permanent injury or death and should be handled with the same rules applied to firearms — including eye protection for everyone present, a proper backstop, and constant muzzle discipline. Steel BBs are particularly prone to ricochet from hard surfaces. Adult supervision is essential for young shooters.
Note: Velocity, energy, and specification figures are manufacturer-rated and vary with ammunition weight, temperature, and the individual gun. Features vary between models within the same product family — verify the specific configuration before purchasing, including barrel type, action type, and magazine design. Airgun regulation varies by state and locality; some jurisdictions classify airguns as firearms, restrict sales to minors, prohibit discharge within city limits, or regulate realistic imitation firearms specifically. Hunting with airguns is separately regulated with species, caliber, and season restrictions. This article is general information, not legal advice; verify current rules where you live before purchasing or shooting.
Affiliate Disclosure: Some links are affiliate links; if you purchase, we may earn a small commission at no additional cost to you. Prices and availability change — verify current details before purchasing.
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