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400e Gen 2 Polymer - Black

Name: 400e Gen 2 Polymer - Black
Brand: Barra Airguns
SKU: 4150
Price: 300.00 USD
Availability: InStock

BB Rifle

$300.00

Product Type: Polymer

Metal Polymer

Color: Black

In stock

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It’s time to spend less time hassling with CO2 cartridges and more time shooting. The 400e, as the first production full-auto .177 BB gun powered entirely by electricity, offers unmatched convenience. The 400e gives you over 1,000 shots on a single battery charge and fires at velocities up to 440 FPS.

The 400e Polymer is built with polymer materials for the upper, lower, handguard, and faux suppressor, making it a budget-friendly option while maintaining the same high-quality internal components as the 400e Metal. The 400e Polymer handles a wide range of steel BBs, giving you the flexibility to shoot various types of ammo reliably and consistently. Its upgraded feeding system provides smoother operations, ensuring an uninterrupted shooting experience.

The 400e comes with a 11.1V LiPo battery, 50 round magazine, speed loader, flip-up sights, and USB balanced charger, so you're ready to go right out of the box.

SKU: 4150

Warranty

This airgun comes with a 1 Year Limited Warranty, providing you with peace of mind and ensuring that your purchase is protected. Learn more.

Shipping & Returns

Free shipping on orders $100+ shipped in the contiguous United States. We only ship to customers that reside in the United States with a physical address, no PO boxes. Learn more.

Returns must be submitted within 30 days from the original order ship date for a refund or replacement. Learn more.

Product Manual

View product manual

Patent Information

This product is protected by U.S. Patent No. 12305954. Barra Airguns actively enforces its intellectual property rights.

Warnings

⚠️ WARNING: This airgun is a replica firearm and must be handled responsibly. Do not display or use this airgun in public, as it may cause confusion or alarm. Never brandish or use this airgun in a threatening manner; doing so may be considered a criminal offense, punishable by fines or imprisonment. Do not alter the coloration or markings required by law to make it resemble a real firearm, as this is dangerous and may be illegal.

⚠️ WARNING: This airgun is not a toy. Adult supervision is required. Misuse or careless use may cause serious injury or death. Always read and follow all instructions before using. The purchaser and user should comply with all applicable laws governing the ownership and use of this airgun.

⚠️ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

⚠️ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

400e Gen 2 Polymer - Black

$300.00

PRODUCT DETAILS

Action

Select Fire

Ammunition

.177 Steel BBs

Powerplant

Electric

Max Velocity

430 - 440 FPS

Operation

The 400e Gen 2 Polymer is powered by an included 11.1V Lithium Polymer (LiPo) battery and USB Balanced Charger, eliminating the need to purchase them separately. With the ambidextrous AR-15 style selector switch, you can easily swap between full-auto, semi-auto, or safe modes. The battery is connected to a high RPM motor and gearbox, designed 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 Gen 2 Polymer features a lightweight yet durable polymer build, including the upper, lower, handguard, and faux suppressor. The polymer 6-position adjustable buttstock with sloping cheek weld balances support and user comfort. It also features a strengthened buffer tube for added durability and includes QD sling mount and slot for other straps.

Accessories

Includes 1x 50-round magazine, speed loader, and flip-up sights. Battery and charger are now included, so you're ready to shoot right away.

Ammo Compatibility

The 400e Gen 2 Polymer is engineered to perform well with a variety of .177 caliber steel BBs, offering shooters a high degree of flexibility in their ammo choices. Its Standard barrel (equipped on all 400e Gen 2 Polymer rifles sold July 2025 and later) is designed for reliable operation across a broad range of BBs. This means it’s less sensitive to minor variations in BB size, shape, or surface finish, allowing you to shoot confidently with different brands without frequent jams or feeding issues. The Standard barrel is ideal for casual plinking, high-volume shooting sessions.

If you purchased your 400e Gen 2 Polymer between October 2024 and June 2025, your rifle came equipped with our Precision barrel. This barrel is machined to much tighter internal tolerances, delivering improved accuracy and consistency shot after shot. However, those tighter tolerances also make it more selective about ammo. To get the best results and prevent feeding problems in the Precision barrel, we strongly recommend using Barra Zinc-Plated .177 Caliber BBs, which are precisely machined and polished to meet the barrel’s specifications.

If you’re looking to upgrade or replace your barrel, we offer complete Standard Barrel Kits and Precision Barrel Kits. Whether you stick with the Standard barrel for maximum ammo flexibility or move to the Precision barrel to push the limits of accuracy, the 400e Gen 2 Polymer lets you tailor performance to your shooting style and goals.

Additional Info

BATTERY REQUIREMENTS The 400e Gen 2 Polymer includes a 3S (11.1V) LiPo battery with a 25-35C rating and Deans (T-Plug) connection. A balanced charger is also included for safe charging and battery maintenance. Using a battery that meets these standards is crucial for maintaining the performance and longevity of your rifle.

COST TO OPERATE The 400e Polymer 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. The included LiPo battery and balanced charger provide 200,000-400,000 shots when 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.

LIGHTWEIGHT POLYMER BUILD

The 400e Gen 2 Polymer is constructed with durable polymer materials, offering a rugged yet lightweight frame for easy handling. The polymer upper, lower, handguard, and faux suppressor provide strength without the weight of metal alternatives, ensuring long-lasting performance at an affordable price.

HIGH-CAPACITY SHOOTING PERFORMANCE

Fire up to 440 FPS with smooth, uninterrupted action. The 400e Gen 2 Polymer's advanced feeding system ensures flawless shooting, offering over 1,000 shots on a single charge, so you can spend more time hitting your target and less time reloading or charging.

AMBIDEXTROUS CONTROLS FOR FLEXIBILITY

Switch between full-auto, semi-auto, or safe modes with the AR-15 style ambidextrous selector switch, designed for both left- and right-handed users. The ambidextrous magazine release and safety add to the ease of control for any shooter.

READY OUT OF THE BOX

Everything you need to start shooting is included. The 400e Polymer comes with a powerful 11.1V LiPo battery, USB balanced charger, 50-round magazine, and flip-up sights. Just charge the battery and you’re ready to hit the range.