400e Gen 2 Polymer - Black
Electric BB RifleSKU: 4150
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.
This airgun comes with a 1 Year Limited Warranty, providing you with peace of mind and ensuring that your purchase is protected. Learn more.
This product is protected by U.S. Patent No. 12305954. Barra Airguns actively enforces its intellectual property rights.
⚠️ 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
Operation
Materials
Accessories
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
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.
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.
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.
Customize Your Rifle
With M-LOK®-compatible accessory mounts, this air rifle offers endless customization options
Versatile Stock with Integrated Battery Storage
Adjustable 6-position stock for a perfect fit, while the buttstock provides secure storage for your LiPo battery, keeping it easily accessible
Ambidextrous Control
Fully ambidextrous selector switch, magazine release, and safety
Durable Polymer Construction
Built with polymer materials for the upper, lower, handguard, and faux suppressor, the 400e Polymer offers a tough and lightweight design
50-ROUND MAGAZINE
High-capacity magazine designed for .177 caliber BBs
Specifications
Plinking
.177 Steel BBs
Electric
Select Fire
2 FPE
430 - 440 FPS
50 rounds
5.2 lbs
18 inches
30.25 inches
Synthetic
Smoothbore
Flat
Manual
Picatinny rail
Polymer with M-LOK
Faux suppressor
11.1V lithium polymer (LiPo) battery, USB balanced charger, speed loader, 50 round magazine
|
|
| |
|---|---|---|---|
| Power source | Electric | Electric | Electric |
| Caliber | .177 Steel BBs | .177 Steel BBs | 6mm Airsoft BBs |
| Action | Select Fire | Select Fire | Select Fire |
| Max velocity | 430 - 440 FPS | 430 - 440 FPS | 330 - 360 FPS |
| Muzzle energy | 2 FPE | 2 FPE | |
| Shot capacity | 50 rounds | 50 rounds | 300 |
| Weight | 5.2 lbs | 6.98 lbs | 6.65 lbs |
| Total length | 30.25 inches | 32 inches | 29 inches |
| Barrel length | 18 inches | 18.25 inches | 12 inches |
| Barrel | Smoothbore | Smoothbore | Smooth |
| Trigger | Flat | Flat | |
| Optic mount | Picatinny rail | Picatinny rail | Picatinny rail |
| Stock | Synthetic | Synthetic | |
| Sound suppression | Faux suppressor | Faux suppressor | |
| Recommended use | Plinking | Plinking | Skirmish |
| View | View 400e Gen 2 Metal | View 400 Airsoft |