4 Umarex Legends Mp German of 2026 For Steel BB Plinking

Oct 11, 2026 3:19 PM

The most expensive mistake in this space is mixing up incompatible 6mm airsoft gear with the .177 caliber steel BB platform, leaving shooters with useless accessories and jammed feed mechanisms. Photos of these vintage WWII German submachine gun replicas look almost identical across retailer sites, making it deceptively easy to order non-fitting magazines that leak CO2 upon installation. Worse still, eager buyers frequently purchase spare magazine listings thinking they found the complete rifle, only to open a box containing a lone metal stick and zero firepower.

Getting this historical replica running smoothly means knowing exactly what to look for before checkout. A proper setup rewards you with heavy blowback action that rips through backyard targets using high-capacity dual-CO2 magazines without a single hiccup. Securing the right hardware comes down to verifying .177 caliber steel BB compatibility, confirming the exact magazine part number 2251814 for dual-capsule power, and checking item titles so a lone accessory does not arrive in place of a full rifle. Here is how to distinguish each option so every shot cycles with crisp, reliable authority.

Umarex Legends MP40 GEN-3 .177(4.5mm) Airgun CO2 Magazine

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9.2
Brand
Umarex

Key specs2

Ammunition Type

.177 caliber (4.5mm)

Platform Purpose

Serves as a dedicated replacement CO2 magazine for .177 caliber MP40 airguns rather than a complete firearm replica.

Pros & cons32

Pros

Dedicated .177 caliber (4.5mm) steel BB magazine designed for the Legends MP40 platform
Self-contained CO2 gas compartment provides direct air power for blowback action
Gen-3 designation identifies updated production hardware for the MP series

Cons

Magazine-only purchase that does not include the Legends MP40 air rifle
BB capacity and dimensional specs are unstated and must be confirmed prior to purchase

Umarex Legends MP Blowback All Metal Automatic .177 Caliber BB

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8.8
Brand
Umarex

Key specs3

Product Format

Complete blowback air rifle

Receiver Construction

All metal

Firing Action

Features automatic blowback operation engineered for .177 caliber steel BB plinking sessions.

Pros & cons42

Pros

Complete air rifle package rather than an accessory or standalone magazine
Authentic all-metal construction delivers realistic handling weight and feel
Automatic firing capability with blowback action mimics classic WWII military hardware
Dedicated .177 caliber BB chambering built specifically for backyard target plinking

Cons

Blowback and automatic cycling consume CO2 cartridges faster during rapid fire
Velocity ratings, magazine capacity, and exact dimensions are not stated in the listing

Umarex Legends MP Blowback All Metal Automatic .177 Caliber BB

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8.8
Brand
Umarex

Key specs3

Capacity

52 rounds

Compatibility Check

Verified to fit the Umarex Legends MP .177 caliber BB air gun model 2251813 using part number 2251814.

Physical Specifications

Height: 14 inches
Weight: 1.3 pounds
Width: 3.5 inches
Thickness: 1.25 inches

Pros & cons42

Pros

Verified compatibility with Umarex Legends MP .177 BB airgun model 2251813
High 52-shot BB capacity reduces reload frequency during rapid-fire target strings
Substantial 1.3-pound weight adds realistic balance to the lower receiver
Backed by manufacturer warranty coverage for verified factory support

Cons

Accessory magazine only, requiring a separate purchase of the Legends MP air rifle
Measures 14 inches tall, requiring dedicated tactical pouches for field storage

HK Heckler & Koch MP5 6mm BB Rifle 200-Round Hi-Cap

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8.6
Brand
Umarex

Key specs3

Ammunition Type

6mm plastic airsoft BBs only

Capacity

200 rounds

Incompatible Airgun Warning

Built exclusively for 6mm airsoft MP5 models (2275052, 2275053, 2275055) and will not fit .177 steel BB Legends MP rifles.

Pros & cons43

Pros

Stamped steel outer shell paired with high-strength polymer internal components
High 200-round capacity designed for extended continuous shooting
Engineered for easy loading and reliable feeding in HK MP5 airsoft series
Verified fit for HK MP5 models 2275052, 2275053, and 2275055

Cons

Incompatible with .177 caliber steel BB guns and WWII Legends MP platforms
Restricted to 6mm plastic airsoft BBs instead of standard airgun ammunition
Requires an airsoft MP5 rifle receiver rather than fitting German MP replicas

Last update on 2026-10-11 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does the Umarex Legends German MP air rifle shoot .177 steel BBs or 6mm airsoft rounds?

The Umarex Legends MP Blowback rifle shoots .177 caliber steel BBs, not 6mm plastic airsoft ammunition. The all-metal German replica is designed exclusively for 4.5mm steel BBs powered by CO2. Modern German-style submachine gun magazines, such as those for the HK MP5 series, are made for 6mm plastic rounds and will not fit or feed in this historical platform.

Which spare magazine part number fits the all-metal Umarex Legends MP rifle?

Part number 2251814 is the correct manufacturer spare magazine for the Umarex Legends MP .177 caliber BB air gun. This 52-shot CO2 magazine matches rifle model 2251813. It weighs 1.3 pounds and measures 14 inches high by 3.5 inches wide, giving you the exact fit needed for continuous plinking.

How do you confirm whether a listing is for the complete rifle or just a magazine?

Check the product title and part number carefully to verify whether it specifies the complete air rifle or an accessory marked as mag only. Complete gun packages state that the item is the all-metal blowback air rifle, while replacement magazines list part number 2251814 and note a single-item package weighing 1.3 pounds. Confirming model numbers before checkout ensures you do not accidentally order a standalone magazine when you intended to buy the actual gun.

Can you use an HK MP5 magazine in the Umarex Legends MP BB gun?

No, HK MP5 magazines cannot be used in the Umarex Legends MP BB rifle. The HK MP5 200-round magazine (part number 2275054) is built specifically for 6mm airsoft models such as the 2275052 MP5 Competition Kit, the 2275053 SD6, and the 2275055 MP5K. Its 10.5-inch by 5.25-inch body is engineered for 6mm plastic airsoft BBs, so it will not lock into the receiver or feed the .177 caliber Legends airgun.

What power source does the Umarex Legends MP40 magazine require?

The Umarex Legends MP magazine requires CO2 to feed .177 steel BBs and drive the blowback mechanism. The CO2 capsules sit directly inside the removable housing, which makes reloading fast during target sessions. If you are comparing realistic CO2 BB gun models for backyard plinking, this self-contained design helps maintain dependable gas delivery across all 52 rounds.

Can the Umarex Legends MP German blowback rifle fire lead pellets?

No, the Umarex Legends MP is strictly engineered for .177 caliber steel BBs and cannot chamber lead pellets. Inserting lead pellets into the 52-shot magazine channel will lead to mechanical feeding jams and potential damage to the internal seals. For shooters who want to practice precision marksmanship with lead ammo, dedicated tactical air rifle options designed specifically for pellets are the proper choice.

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WRITTEN BY

Donald Whiteley

I'm a huge sports and hunting fan, and I love sharing my knowledge and experiences with others. I'm an editor for bestairriflescopes.com, Sports and Hunting Reviews, to do just that - share my love of sports and hunting with the world.