Most Powerful Fully Automatic BB Guns In 2026: By A US Army Ranger

What is the most powerful full auto BB gun? I set out to answer that question in this hands-on review of my top picks.

FYI, prices and ratings are accurate as of time of writing.

Here's my take on the most powerful full auto BB guns I've crossed paths with over the years. If you prefer a broader roundup, check out our review of the best air rifles.

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1. DPMS - Best Automatic BB Gun Overall

HIGHLIGHT:

Comfortable and realistic in its operation.

REALISTIC FEEL:

We unpacked the air guns as they showed up, and the first one we opened was the DPMS. According to the paperwork, this air rifle will shoot 1,400 rounds per minute. This DPMS will give a shooter a life-like feel for handling the rifle, so it may be a good fit for training with the real firearm.

SIGHTS AND OPTICS:

The sights need to be thrown away and replaced with actual flip-up sights. However, better than replacing them with flip-up sights, use a red dot like the SIG Romeo 5, and you have a red dot that will work as hard and as long as this little air rifle. Being a copy of a full-size AR-15, this rifle can benefit from a Low Power Variable Optic (LPVO) scope if you need to shoot a pigeon or two from the fence or rooftop.

TRIGGER FEEL:

One thing that is different from the actual gun is the trigger, and that's because of the way air rifles work. The trigger is stiff until the last 10% of trigger travel, then it lets go and sends the BBs down range. This trigger is similar to a two-stage trigger in the way it has two different pull weights until the round is released. The DPMS firearm has a different and better trigger pull. For an air rifle, the trigger pull is about six pounds and stiff. With the heavy trigger pull, shot placement is harder to perfect. The trigger pull made this gun take a back seat for targets and move into full auto only and for fun.

CQB PRACTICE:

This air rifle will provide excellent opportunities for Close Quarters Battle training at indoor lengths, like across the room and down a hallway. The significant part about using BB guns is using canvas tarps to stop the rounds and save the "house" from damage.

PICATINNY ACCESSORIES:

The rails supplied by DPMS will fit any Picatinny accessory, from forearm-mounted stuff to optics. And since the sights are so nasty, this is a good place to test out the different types to see which ones you want to leave on the air rifle and then put them on your actual AR-15 rifle. I find air rifles that are this close to the real thing to be great for letting customers try on goodies that I can fill a bag with, and then they can take them home, or bring the gun to me, and I will install it for them.

KEEP IT LUBED:

According to the manual, the DPMS requires regular cleaning and maintenance. The internals must be oiled like an air wrench or pneumatic paint sprayer. According to the manual, just a drop in the inlet to start, then a drop every thousand rounds or so. I use Prolix for everything except heavy machining, as the water-based lubricant will evaporate away as steam. Use a lubricant that will not hurt your eyes if it splashes in your face when the gun is running at full auto, and Prolix is the one I find to do it all.

CO₂ BURNS FAST:

The DPMS works with CO₂ cartridges and has the same issues of CO₂ cartridge costs (you will use a lot of them) and power dropping quickly. We learned that full auto out of the box would not work well; it takes a few semi-auto sessions to get the air gun to wear in, and then full auto until the store runs out of CO₂ cartridges. The power loss from the CO₂ comes from the "man-child" mentality of shooting full auto only, like money grows on trees or something. The consistent hits on a six-inch target, even at full auto, are excellent and fun. Use a six-inch splatter target and watch the paint disappear quickly. It's an easy fix when the power loss happens; just replace the CO₂ and get back to training.

NO MALFUNCTIONS:

Once broken in, this DPMS AR replica has never stopped or malfunctioned. When we were in the field shooting like idiots, all we did with it was shoot in full auto. The DPMS will shoot in semi-auto, but we did not have that much discipline; it was full auto only, baby! With regular lubrication, we didn't have a single hiccup.

BUILD QUALITY:

The DPMS comes equipped with an adjustable butt stock that works just like a genuine AR rifle buttstock. It's made of high-quality plastic and metal where needed. I see nothing wrong with the build quality; this air rifle will last many hours of playtime or honest training.

Get it from Amazon now: $199.99 & FREE Returns

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2. Crosman CAK1 - Best AK-Style Full Auto BB Gun

HIGHLIGHT:

An AK-47 simulation gun that feels like the real thing.

AK-STYLE:

The plastic stock and foregrip are the only things that do not look like an actual AK-47 variant. The Crosman CAK1 only needs a wood stock and foregrip to feel like the real thing. The Crosman CAK1 uses black plastic stocks, which are shiny black and will give it away immediately. The pure blackout style looks very cool, almost like a Batman movie prop. If a neighbor sees you lurking around taking out trespassing pigeons or vermin with one of these, the cops may show up and immediately have a very intense conversation.

NOISE FACTOR:

The Crosman CAK1 is quite loud when it shoots BBs, to the point that you need hearing protection when using it, especially if it is indoors. The noise comes from a sudden and explosive air release down a tiny tube, and a BB is only .177 of an inch across. When that much air pressure is focused into that small a space, the result will simply be a loud noise due to expansion. In the adult air gun market, you should use hearing protection unless the manufacturer uses a suppressor, like the Stoeger and others. Even with a built-in suppressor inside my garage shop, the noise level is close to being too loud. And ALWAYS use eye protection, even if you are not using steel or copper BBs and are shooting airsoft guns. Eyeballs are easy to damage; just use shooting glasses.

MAG DRILLS:

The Crosman CAK1 air gun is easy to load and clean, with a lightweight trigger pull. The magazine is the size and shape of an actual AK-47 magazine. The difference is not all that much, as the magazine holds 28 BBs (lame), and a real AK magazine holds 30 rounds. Reloading is completely different; it is a BB gun, after all. Counting bullets, or round count awareness, will be the same, which will benefit training with this air rifle.

RATE OF FIRE:

The fun factor of this air gun is worth the money. The owner's manual says the rate of fire is about 1,400 per minute. I don't know how they fired that many in a row; they may have just used math and hoped it would shoot that many in a row on full auto. This is also a good plan, especially if you happen to be a vendor at the gun show. Using this for a demo ensures the customer does not “flag” people with a real gun. It's not OK, but it is safer, especially if there is no CO₂ in the gun to fire the BBs.

AK ADD-ONS:

An air rifle that is easy to load and fun to shoot had us going broke in a hurry. Many AK-style accessories will fit this air rifle. So, if you and your crew need to practice using a flashlight and don't want to go to a range in the dark, you can go to the weeds in the dark to practice, and this will do it.

Get it from Amazon now: $174.99 & FREE Returns

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3. Crosman CFAR - Best AR-Style Full Auto BB Gun

HIGHLIGHT:

The kit includes an upgraded red dot.

REALISTIC AR REPLICA:

The CFAR is a short barrel-style AR Platform copy. Most AR-style functions work like the real thing, except the forward assist; the chamber has no round to tap forward. This air gun looks and feels natural and will work great for safe practice and handling training. When I say most of this gun works like a true AR, let me tell you about the parts of this air rifle that do: the charging handle, safety selector, magazine release, bolt release, and ejection port cover.

REALISTIC WEIGHT:

That is not all. The stock also has the standard six-position adjustment options. Even the take-down pins work the same as those on an AR platform rifle. With an accurate weight, the shooter can get a feel for the size and shape of a short-barrel AR rifle and add and subtract accessories, which may save some wasted money in the long run.

CO₂ CARE:

To keep up on the maintenance of this AR platform model gun, Crosman tells us to put a drop of oil or Prolix (my favorite) on the seals of the CO₂ cartridges to prevent them from drying out and improve the seal. In the manual, Crosman also tells us not to leave the CO₂ cartridges in the gun; use them up, and then remove them after the day of shooting. The owner's manual will show a few places to add a drop or two of Prolix to lube the moving parts, and that will also keep the rust from setting in if this gun plays outside in the rain.

TRAINING TOOL:

This air gun is not made to be a tack driver or even close. It's made to shoot in full auto (or semi) and have a lot of fun. If you need this, and by need, I include having fun with a new air rifle, this option is a perfect fit.

ACCESSORY-READY:

Standard Picatinny accessories will fit the rails on the CFAR, and this will be an excellent addition to my gun show kit to show off items that customers can buy and take home to install on their guns at home. I think a fully loaded AR-15 model may help sell more stuff when customers can check and see if a product is a good fit for their needs. A front swivel mount for a sling will work; a forward vertical handle, weapon-mounted lights, you name it, will fit. To help with accuracy, I suggest using the included red dot optic. Since the CFAR is a short barrel rifle model with a six-position stock, this is not the place for a Low Power Variable Optic (LPVO) scope, but a red dot may be the magic.

Get it from Amazon now: $196.99 & FREE Returns

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4. Sig Sauer MCX Rattler - Best Burst-Fire BB Gun

HIGHLIGHT:

Ambidextrous selectors and magazine releases.

THREE-ROUND BURST:

It's time to talk about a BB gun that I absolutely do not need and enjoyed a lot. A buddy of mine and I were looking at different full-auto BB guns for the shooting experience business he is going to create. Once this Sig Sauer MCX Rattler came into view, we had to have one. This option is the only one we tested that has semi-auto and three-round burst options. It has been a very long time since I shot a three-round burst, and let me tell you that it was a lot of fun.

FOLDING STOCK:

The Rattler has a functioning side folding stock and is made of high-quality parts. Practicing with the side folding stock is a new experience that many shooters have not had before. A side folding stock is great for concealment and storage but can be a giant stumbling item.

TRUE-TO-LIFE FEEL:

If a product is a stumbling item, in a real encounter, it may end up with the bad guy winning or the good guy shooting himself. This is the time to find out if the side folder is a bad idea, not in the thick of things when everything is getting harmful and dangerous. The MCX Rattler has some weight to it, so this is a great way to test out the fit of this style gun for the shooter. The metal barrel and heavy-duty inner parts give this option some heft; again, the BB guns in this application honestly blow my mind.

ACCESSORY OPTIONS:

Adding and subtracting accessories on this model is a great idea to ensure it is the right choice. For this gun, I mounted a laser sight. Adding a magnified optic is wasted money, but the laser is amazing. I recommend trying the one Olight makes, a flashlight with laser combo.

NOT BUILT FOR PRECISION:

The Rattler has a very short barrel, more like a pistol than a rifle, not even a short-barrel rifle. The shorty is not good at hitting bullseyes when shooting a target and even less of a tack driver when shooting in a burst. This air gun is not designed to be a precision shooter (with the side folder locked out to use on the shoulder or folded) but a small and super fun, three-round burst shooter.

POP-UP SIGHTS:

The Rattler comes equipped with flip-up sights. The sights are the peephole style, which works well when using the side folder stock. The peephole sights are almost worthless when shooting the Sig Sauer MCX Rattler like a pistol. If you need to shoot in pistol mode, you can put on a red dot sight and use it that way, which is what we did. The red dot was left in place for use with the side folder stock open. Since this air gun is a Sig Sauer, we used a Romeo 5 red dot, which works like a dream. The flashlight and laser combo were from Olight.

Get it from Amazon now: $169.99 & FREE Returns

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5. Umarex Legends M1A1 - Best Thompson BB Gun Replica

HIGHLIGHT:

The only Thompson I can get my fingers on is an air rifle.

BUDGET WARNING:

Owning one of these is like going to Vegas, one of the fastest ways to spend a lot of money and have nothing to show for it. The money I spent shooting this Thompson-style gun, the M1A1, wasn't on the BBs. BBs are cheap, and I can buy a bottle of 500 for about 15 bucks or less. The ammo is cheap and easy to get; it's the CO₂ cartridges that will bleed you dry. When I started shooting the Thompson copy, it was an addictive thing. Make sure you have a budget and stick to it for CO₂ cartridges.

SAFE SHOOTING REMINDER:

The fun factor of this air gun is at the highest levels. One thing your inner child needs to remember is that this air rifle will hurt and possibly damage other people or critters that don't need to be hurt. This is not like an airsoft gun that people can shoot at each other.

BUILD QUALITY:

I don't know if the original Thompson used a sling as an original option. If I am going to carry this for a while, I will get one and use the sling mounts. The Thompson copy is made to replicate the original for the experience. The one place Umarex did not hit the mark exactly is that the stock on the original is made from hardwood, not plastic. The stock is a wood-looking plastic, totally fake but of high quality, not the standard cheap, hollow, weak plastic. Most of the air rifle is metal, which gives the gun its heft. According to the manual, it weighs seven and three-quarter pounds; I did not put it on a scale because who would do that in the real world?

AUTHENTIC FEEL:

The army used the Thompson on the front lines as a full auto high-capacity rifle. Then they went to bigger-sized guns, and now they are back to a gun about the same size as the Thompson with the M4 carbine rifle. So, for people looking for a training tool or a more authentic experience, the action does have a blowback feature, which adds to the feel of authenticity, short of the noise and gunpowder blowing in your face.

TRAINING VALUE:

An actual Thompson is far too large to carry like a modern carbine, but that's exactly what makes shooting it so unique. This M1A1 copy will teach a shooter how to aim and operate the Thompson. While only a few people will ever use the real thing, this replica provides a realistic way to experience its controls, size, and handling, and therefore serves as a great training tool.

PURE FUN:

On the childish side, who does not want to shoot a Thompson, especially in full auto from the hip, as we all learned by watching movies and old TV shows? This Umarex comes with the stick magazine and not the drum magazine like they used in the gangster movies, which was a little disappointing. If you can afford it, get one for no good reason. It's just a fun one to have.

Get it from Amazon now: $289.99 & FREE Returns

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6. Umarex Legends MP 40 - Best MP 40 BB Gun Replica

HIGHLIGHT:

Realistic blowback in a submachine gun.

FULL-AUTO FUN:

This submachine gun copy is just too cool to pass up. I am still trying to determine what practical application training with an MP 40 copy air gun has, but the fun-as-hell factor is worth the price. There is just something about this little full-auto BB gun that makes me go a little crazy. Shooting BBs from the hip is much more affordable than shooting 9mm Luger or .30 Luger by the bucketful.

SHOOTING EXPERIENCE:

Most people who shoot BB guns use a box to catch and reuse BBs. Trying to catch BBs while shooting the Umarex Legends MP will not work very well. This thing will spray BBs all over the place because the shooter is going nuts and having a great time doing so, not recoil. The Legends MP has zero or effectively zero recoil.

CO₂ COST:

The only expensive part of the Umarex MP is the CO₂ cartridges. When playing, I mean training with the Umarex MP 40 copy, everyone uses more ammo and CO₂ than needed. I spent all my actual firearm ammo budget on CO₂ cartridges in about an hour while shooting this air gun. I will do it again if I ever get this back in my hands.

SIZE & WEIGHT:

My favorite part of this air rifle is that its size and weight let a shooter learn its limits and figure out which accessories are needed and, even more importantly, which aren't.

RELIABLE AFTER BREAK-IN:

When I was shooting this with my buddy and testing it for the new shooter experience business he was creating, we never experienced a malfunction. I think we each shot about 3,000 BBs as fast as we could. Since this is an air rifle that uses CO₂ canisters, the power drops off after about 50 rounds, as anyone would expect. One thing that we discovered when shooting is that filling the magazines gets to be an immense pain in the neck. However, that pain is quickly replaced by the joy and plain old fun of shooting this little gun at full auto and shredding a splatter target into powder.

NOT FOR PESTS:

Shooting after pigeons or rodents is not what this gun is made for. If you can hit the critter, I am sure you will place it in the dumpster, but hitting it will be hard.

EXTRA MAGAZINES:

Extra magazines can be bought and loaded to practice magazine reloads. With an air gun, reloading on the move is safer, and the shooter will improve with more practice. The extra magazines are expensive and will remain costly due to the low demand from MP 40 air gun shooters.

WEATHERED FINISH:

One part of this little Umarex I liked that my buddy did not was the wear and tear on the paint. When the paint wears off of the edges and corners, this lets the metal shine through. Scruffy and tattered magazines and edges make the Umarex Legends MP look more realistic and even more formidable than it did brand-new. I may get one to put on the wall to look cool on Zoom and things like that; what a backdrop!

Get it from Amazon now: $199.99 & FREE Returns