The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished
The 400E Factory Refurbished

The 400E Factory Refurbished

BB Rifle
$350 $400
select fire
177 bb
410 fps
The Barra 400e is the world's first and only production full auto .177 BB gun powered exclusively by electricity. Featuring patent pending technology, this BB rifle is built with a CNC aluminum receiver and handguard. Highly accurate and customizable out of the box. Pick yours up today and make it your own.
View Full Specifications


It's time to spend your time actually shooting rather than fumbling with CO2 cartridges. The 400e is the first and only production full auto .177 BB gun powered completely by electricity. One battery charge gets you over 1000 shots. Featuring patent pending technology, the 400e can maintain velocities ranging between 380 and 410 fps. The consistent velocity and engineering of the rifle allow for high levels of accuracy for a BB gun. With rates of fire between 500-600 RPM (depending on battery C rating), it's fast enough to be fun, but slow enough to engage all your targets before needing to reload. With the included 50 round magazine, this gets you over 5 seconds on full-auto before needing a mag change. That's over 4x longer shooting than comparable fully automatic CO2 rifles.

OPERATION The 400e is powered by a widely available Lithium Polymer (LiPo) battery commonly used in high end airsoft guns or RC cars. With the ambidextrous AR-15 style selector switch, easily swap between full-auto, semi-auto, or safe modes. The battery is connected to a high RPM motor and gearbox. We made the 400e gearbox to withstand extreme force and extended firing sessions. Unlike many airguns, the 400e performs great in all types of weather with virtually no performance decline in temperatures between 32F(0C) and 90F(32C). 

MATERIALS The 400e is built like a real rifle with a full CNC aluminum receiver and handguard. Includes M-LOK® compatible accessory slots on the handguard for modular flexibility. The polymer 6 position adjustable butt stock with sloping cheek weld balances support and user comfort. Includes QD sling mount and slot for other straps.

STYLE  Designed as a modern sporting rifle with no frills and a clean frame. The 400e looks great out of the box but is still highly adaptable for you to customize and make it your own. 

ACCESSORIES Includes 1x 50-round magazine, speed loader, and flip up sights. Battery and charger are sold separately. 

BATTERY REQUIREMENTS Using a 3S (11.1V) LiPo battery with a 25-35C rating and Deans (T-Plug) connection is required. A XT60 or XT30 male to female deans connector is acceptable as long as it is a battery that meets the standards stated above. DO NOT use a battery that is below or exceeds these standards as it may damage your motor and gearbox. Using a balanced charger is recommended to safely charge and balance your battery. Please follow the instructions for charging and use found with the battery and charger that you use.

COST TO OPERATE The 400e is extremely efficient to operate and more than *100 times cheaper per shot than a full auto CO2 rifle. A 40 count CO2 pack costs about $25 and gets approximately 2,000 shots with a full auto CO2 BB rifle. A LiPo battery and balanced charger are about $30 and should get 200,000-400,000 shots with the 400e when the battery is properly maintained.

*Energy cost for battery usage was calculated based on The National Average Energy cost of 14.8 cents kWh, a 2200 mAh battery, and an 800 mA B3 charger. Energy cost for CO2 based on 60 cent cost per cylinder and 100 shots per two cylinders. 



.177 (4.5mm)

ACTION Select Fire

2 fpe

SHOT CAPACITY Includes 50 Round Magazine
WEIGHT 7.5 Lbs
STOCK Synthetic
BARREL Smoothbore
OPTIC MOUNT Picatinny Rail

Speed loader

FOREGRIP Aluminum with M-LOK

Product Manual


Shipping & Returns


FREE ground shipping on any order $50 and up shipped to the contiguous United States.

Barra Airguns ships only to consumers that reside in the United States with a physical address (no PO boxes).  Please email for inquiries about international shipping. 

In-stock merchandise will normally arrive in 3-6 business days (AK & HI add 7 days). Holidays may delay shipping. Shipping charges depend on destination and item weight.

It is your responsibility to know the laws in your state, county, and city and to fully comply with them.   Barra Airguns does not authorize that you may legally purchase, possess, carry or utilize air rifles, air pistols, pellets, or any other items, which you may order from Barra Airguns or one of its websites. 



If you are not satisfied with the original condition and/or performance of the item(s) purchased from a website of Barra Airguns you may return the item within 30 days from ship date for a refund or replacement. To qualify for refund or replacement, items must be returned in their original packaging with all tags and stickers attached. Once we approve your request, return unused items, in the original box with all accessories, warranty cards, owner's manuals, etc. within 30 days for an exchange or refund. You will need to put your boxed item in a separate box to ship so that the packaging it stays in mint condition. We will charge a restocking fee for any damaged packaging. 

Ship returns to Barra Airguns via UPS, FedEx or USPS Priority Mail for tracking/confirmation purposes. Use this address: Barra Airguns. 11427 N Highway 59, Gravette, AR 72736

Returns without the complete original packaging may not be accepted. 

Shipping and handling is non-refundable except in the case of defective merchandise shipped within the United States. Shipping for returned merchandise should be pre-paid. 

Please allow 2-4 weeks from the date we receive the return for credit or refund. We assume no liability for loss or damage of returned packages. We recommend you purchase insurance from your shipper. Returning merchandise nullifies your ability to take advantage of any promotions or rebates that may be associated with it. 


Customer Reviews

Based on 4 reviews
So much fun

Ive put 3000 BB’s threw it and not a problem. I have a top of the line C02 fully auto MP5 and at best on a hot day i get almost 80 rounds outa the 2 C02 carts and the accuracy is within about 12 inchs. Yeah it shoots a little faster But this Barra will group 500 rounds in about a 1 inch circle. And i say 500 BB’s cuz after loading 10 clips on the same target i was convinced this is the most accurate full auto anywhere. And definitely the cheapest to shoot Period

William Johnson
The Best !!!!

I own 22 air guns and this is the one that I love the most. You guys did a super, super job on this one. I can not fine anything wrong with product.
Keep up the good work !!!!!
William Johnson
Washington DC

hennessey brown
great gun but clip and speed loader is not

I’m happy with the purchase and i would tell my friends about it
My only beef is the speed loader and clip
You would think a clip that large could load more than 50 bb
the speed loader is take forever to load and is anything but speed
Once I spend 30 min monkeying around with speed loader it was fun to use.
The gun A+
clip C
speed loader F

Thomas Wyse
Accurate Modern BB gun

Great BB gun. They should market how accurate this bb gun is. With match I am able to get same hole groups at 5m. That rivals daisy's worlds most accurate bb gun the model 499b. I had a couple problems such as a loose buttstock and a rough magazine catch, but Barra's excellent customer service walked me through every problem and solved it. Only a few things I would change on this gun. Reduce the rattle somehow on the fo bolt release. Improve the trigger by using a microswitch (although every AEG has had the similar long but light pull). Last thing would be to iron out and develop a bb speed loader that works without having to treat it like a maraca, a lot of other .177 speed loaders are finicky, this one is no different. An excellent product.