We Help You Find The Best Full Auto BB Gun

OK, with many of us getting “stir crazy” staying at home, now may be the time to help you find the best full auto BB gun. Full auto BB guns are a ton of fun to shoot – of course!!!

If you want to give one a try, keep reading this HAM guide before making your decision…

As you would expect, these BB guns are all CO2-powered. In deference to the high magazine capacity and rapid rate of fire, they all use two 12 Gram CO2 cartridges installed in a detachable magazine. This doesn’t give more power, but increases the shot count per CO2 fill.

We Help You Find The Best Full Auto BB Gun

Like all CO2-powered airguns, FPS drops with fast shooting. So be prepared for some serious stringing down the target if you keep the “fun switch” engaged on these guns for a full magazine’s worth of BBs.

But that’s part of the fun! These full auto BB guns are all quite accurate in single-shot (semi automatic) mode. But, of course, much of the fun of these guns is that – if you don’t hit that soda can with the first burst – you just have to fire again 🙂

Today we look at three outstanding models in order to find the best full auto BB gun. All have great blowback actions and all are replicas of centerfire sub-machine guns. All are HAM Gold Award winners, so you can’t go wrong. In alphabetical order, we have…

1. Bushmaster MPW

2. Legends MP40

3. Legends Thompson

The MP40 and M1A1 Thompson are faithful reproductions of the WW2 centerfire originals. The Bushmaster is not a precise reproduction of any specific firearm, but it’s obviously a spirited rendition of a shorty M4-style model. They all look like the real deal, so remember to handle with appropriate caution!

Bushmaster MPW

The MPW offers realistic blowback action, accuracy and a great shot count. It looks and feels like an M4. And that “rock and roll” full auto capability that’s guaranteed to bring a smile to every face!

We Help You Find The Best Full Auto BB Gun

Uniquely among these BB guns, it also field strips just like powder burner M4s. The manufacturer reinforces this realistic look and feel by promoting that stocks, pistol grips and other accessories designed for centerfire ARs will fit the Bushmaster MPW Full Auto BB Gun.

It’s supplied with a collapsible stock, red dot sight and fake suppressor. There’s tons of Picatinny rails for mounting other accessories, too.

The price is realistic and it’s backed by good 12-month warranty coverage and great support from Velocity Outdoor – the company formerly known as Crosman Corporation. You can read HAM’s full test review here.

We LikeWe Don't Like
AccuracyNot a precise replica
Great shot countNot much else!
Can be field stripped
Crosman Bushmaster MPW

Legends MP40

The HAM Team just loved the Umarex Legends MP!

We Help You Find The Best Full Auto BB Gun

This is a very accurate replica of the iconic German MP40 submachine gun, one of the coolest-looking subguns ever manufactured. Shooting it gives maximum smiles per minute, particularly on full auto…

The HAM Team had a blast shooting the Umarex Legends MP and so will you. It easily earns a coveted HAM Gold Award. We feel it’s great value for money in smiles per Dollar!

Accuracy is great, shot count is high and the Muzzle Velocity is good, too. Add that to a strong, “hammering” blowback action and there’s little else that anyone could want in a BB submachine gun.


We Help You Find The Best Full Auto BB Gun

We LikeWe Don't Like
AccuracyNo BB loader retaining slot
PowerOnly a 90 day warranty
It's just sooo cool!!!Not much else!
Umarex Legends MP40 CO2 BB Submachine Gun 0.177

Legends Thompson M1A1

The M1A1 Thompson BB gun is simply an amazing airgun. It combines extreme realism of appearance and operation with a very high shot count. That 96% HAM score equals that of the best we’ve ever awarded – to the MP40. It’s an obvious HAM Gold Award winner!

We Help You Find The Best Full Auto BB Gun

Umarex USA makes some claims for the M1A1 Thompson BB gun. These are as follows and we’ll check them out:

– A realistic reproduction of the firearm. Check!

– Realistic full auto, open bolt blowback action. Check, check. It’s so realistic that the muzzle even climbs a little on extended full-auto firing!

– Up to 435 FPS Muzzle Velocity. Check. The M1A1 Thompson BB gun tested by HAM actually peaked at 402 FPS with Crosman Copperhead BBs at 62 Degrees F. This HAM test result of 402 FPS at 62 degrees would match the manufacturer’s claim at 78 degrees ambient temperature. So it would exceed the claim at higher temperatures, peaking at about 460 FPS at around 90 Degrees F. That’s hot performance for a BB gun!

We LikeWe Don't Like
AccuracyNo BB follower hold down
Great shot countOnly a 90 day warranty
Very faithful replicaNot much else!
Umarex Legends M1A1 BB Gun

And the best full auto BB gun is???

That’s easy. It’s the one you like the look of most!

These are all outstanding BB guns. They’re all surprisingly accurate and powerful.

If you want the added fun of being able to field strip the gun, plus the security of a 12-month warranty, it has to be the Bushmaster.

If your preference is for the most realistic-possible WW2 sub gun experience, then the MP40 and the Thompson give you that in spades.

Whatever your choice, please remember to shoot safe when you’re having this much fun!!!

SAFETY FIRST. With all BB-firing airguns, it’s mandatory to wear shooting glasses at all times, even if just watching. Also do not shoot at hard surfaces or water. BBs tend to bounce off these surfaces and may hit you, or something other than what you intended. If in doubt, don’t pull the trigger! Pellets generally do not bounce back in the same way and are the correct choice for hard targets. Due to the realistic appearance of these products, handle them as you would a firearm. Do not display in public or in any place where they could be mistaken for cartridge firearms.