10 Umarex Mp5 Co2 of 2026 For Backyard Plinking

1

Umarex High-Grade CO2 Cartridges for Pellet Guns, BB Guns and

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  9.4
• Brand
  Umarex

Key specs2

Gas Capsule Capacity

12 grams

Airgun Compatibility

Engineered to fit standard 12-gram CO2 air rifles and pistols, matching the power requirements of semi-automatic BB platforms like the MP5 K-PDW.

Pros & cons32

Pros

• Standard 12-gram size fits the Umarex HK MP5 K-PDW and standard CO2 air rifles
• Clean gas formulation helps protect sensitive internal valves from debris
• Compact 12-count pack offers an accessible starter supply for range sessions

Cons

• Small pack size requires frequent reordering for rapid-fire semi-automatic shooting
• Delivery is restricted to specific zip codes per shipping regulations

2

Umarex High-Grade CO2 Cartridges for Pellet Guns, BB Guns and

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  9.4
• Brand
  Umarex

Key specs2

Quantity

30 cartridges

Valve Protection

Formulated to leave minimal residue, keeping internal airgun seals and valve chambers clear during repetitive cycling.

Pros & cons32

Pros

• Bulk 30-count pack provides ample gas for extended semi-automatic plinking sessions
• High-grade clean gas formulation avoids dirtying internal firing valves
• Direct compatibility with standard 12-gram CO2 rifles and pistols

Cons

• Cartridges are non-refillable and must be recycled after depletion
• Regional shipping limitations restrict purchase in select zip codes

3

Umarex High-Grade CO2 Cartridges for Pellet Guns, BB Guns and

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  9.4
• Brand
  Umarex

Key specs2

Cylinder Size

88 grams

Platform Suitability

Designed strictly for airguns built with 88-gram receiver threads. Do not purchase this for 12-gram airguns like the Umarex MP5.

Pros & cons33

Pros

• Large 88-gram capacity delivers hundreds of shots for compatible high-volume rifles
• Clean CO2 mixture prevents valve contamination over extended shooting sessions
• Sturdy threaded neck ensures a secure seal in compatible bulk-fill platforms

Cons

• Incompatible with standard 12-gram housings including the Umarex MP5 K-PDW
• Must remain threaded into the rifle until fully depleted to avoid venting gas
• Subject to regional zip code shipping restrictions

4

Umarex NitroAir Prefilled Nitrogen Cartridges for N2-Powered Airguns, Pack of

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  9.4
• Brand
  Umarex

Key specs2

Operating Pressure

3,600 psi (Nitrogen)

Critical Safety Note

NitroAir cartridges must never be used in CO2 airguns. CO2 systems operate at much lower pressures and cannot withstand 3,600 psi compressed nitrogen.

Pros & cons33

Pros

• Delivers 3,600 psi compressed nitrogen for purpose-built N2 airguns
• Can remain installed in designated N2 rifles during storage without seal harm
• Inset piercing surface helps prevent accidental installation in CO2 hardware

Cons

• Dangerous and strictly incompatible with CO2 airguns like the Umarex MP5
• Requires manual degassing via airgun bleed valve prior to cartridge removal
• Limited strictly to Umarex N2 platforms such as the Komplete NCR

5

Umarex Colt Peacemaker Revolver Single Action Army Six-Shooter .177 Caliber

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  9.2
• Brand
  Umarex

Key specs2

Muzzle Velocity Benchmark

Up to 410 fps

Action and Loading

Utilizes individual reusable metal cartridges holding single .177 steel BBs, offering realistic single-action revolver operation.

Pros & cons42

Pros

• Full-metal frame construction delivers authentic weight and classic handling
• Fires .177 steel BBs up to a listed 410 fps using individual loading shells
• Convenient 12-gram CO2 compartment integrated directly into the grip frame
• Includes 6 realistic BB cartridges for authentic single-action revolver loading

Cons

• 6-round cylinder requires manual shell reloading between strings
• Single-action mechanism requires manual hammer cocking before every shot

6

Ruger Explorer Youth Break Barrel .177 Caliber Pellet Gun Air

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  8.8
• Brand
  Umarex

Key specs2

Powerplant Design

Break-barrel spring piston

Shooting Pace

Requires breaking the barrel to load each individual .177 pellet, prioritizing deliberate marksmanship over rapid-fire plinking.

Pros & cons32

Pros

• Break-barrel spring powerplant requires no CO2 cartridges or external air tanks
• Chambered in .177 caliber for shooting standard target and plinking pellets
• Youth-oriented sizing provides manageable cocking effort and reduced weight

Cons

• Single-shot cocking action lacks the rapid semi-automatic fire of an MP5
• Manufacturer specifications for velocity and dimensions are not listed in data

7

Umarex 2252109 Brodax Air Pistol .177 BB , Black

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  8.6
• Brand
  Umarex

Key specs2

Ammunition Format

.177 caliber steel BBs

Verification Advice

Key specifications such as velocity, magazine capacity, and CO2 loading method are omitted in product data and should be verified before purchase.

Pros & cons32

Pros

• Fires accessible .177 steel BBs for economical backyard target shooting
• Handgun format provides a lightweight alternative to full tactical carbines
• Simple black polymer exterior designed for easy handling

Cons

• Missing published velocity, capacity, and dimensional specifications in listing
• Does not offer the shoulder-supported stability of a PDW carbine stock

8

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

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  8.6
• Brand
  Umarex

Key specs2

Magazine Feed Spec

200 rounds (6mm plastic BBs)

Compatibility Warning

This magazine is engineered solely for 6mm airsoft models. It will not fit, latch, or feed into the Umarex .177 steel BB MP5 air rifle.

Pros & cons32

Pros

• High-capacity design holds 200 rounds of 6mm plastic airsoft BBs
• Heavy-duty stamped steel shell with durable internal polymer components
• Fits official Umarex HK MP5 airsoft series 2275052, 2275053, and 2275055

Cons

• Completely incompatible with .177 steel BB airguns like the MP5 K-PDW
• Feeding mechanism is designed strictly for plastic airsoft sphericals

9

Umarex HK Heckler & Koch MP5 K-PDW Semi Automatic .177

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  8.4
• Brand
  Umarex

Key specs3

Action Mechanism

Semi-automatic repeater

Caliber and Ammo

.177 steel BBs

Intended Setup

The definitive Umarex MP5 .177 BB platform for backyard plinking. Pair exclusively with standard 12-gram CO2 cartridges and .177 steel BBs.

Pros & cons42

Pros

• Semi-automatic firing action replicates authentic HK MP5 rapid-fire shooting
• Chambered in .177 caliber for affordable and accessible steel BB plinking
• Compact PDW design offers maneuverable handling for backyard target setups
• Authentic Heckler & Koch styling licensed directly through Umarex

Cons

• Steel BB barrel is not designed for shooting precision lead pellets
• Specific magazine capacity and FPS ratings are not detailed in listing data

10

Crosman 1077 RepeatAir Semi-Automatic CO2-Powered .177-Caliber Pellet Air Gun, Black,

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  8.0
• Brand
  Crosman

Key specs2

Rifle Powerplant

12-gram CO2 semi-automatic

Ammunition Type

.177 caliber pellets

Pros & cons32

Pros

• Semi-automatic repeater action enables rapid successive shots
• Fires .177 caliber pellets for clean target punching and plinking
• CO2-powered mechanism eliminates manual cocking or multi-pump effort

Cons

• Pellet firing system is not compatible with steel BB ammunition
• Specific shot capacity, velocity, and weight must be verified from listing

Last update on 2026-10-07 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does the Umarex MP5 run on 12-gram CO2 cartridges or 88-gram tanks?

The Umarex HK MP5 K-PDW semi-automatic .177 air rifle uses standard 12-gram CO2 cartridges inserted directly into the receiver. It is not built to accept 88-gram CO2 tanks, which are much larger cylinders designed for high-capacity rifles. Attempting to attach larger cylinders or non-compatible fittings will damage the puncture assembly. For smooth plinking sessions, stocking up on packs of standard 12-gram capsules ensures you have the exact power source the internal valves require.

Is the Umarex MP5 airgun built for .177 steel BBs or 6mm plastic BBs?

The Umarex HK Heckler & Koch MP5 K-PDW is engineered strictly for .177 caliber steel BBs. Umarex also licenses airsoft versions under the Heckler & Koch line that fire 6mm plastic BBs, which causes frequent confusion during checkout. You cannot fire lead pellets, larger shot, or 6mm plastic rounds through this .177 steel barrel. Loading the incorrect ammunition can instantly jam the feed track or ruin the smooth-bore barrel of your CO2 BB gun.

Will HK MP5 airsoft magazines fit the .177 caliber BB airgun?

No, airsoft magazines will not fit or feed in the .177 caliber BB model. For example, the HK MP5 200-round high-capacity magazine (part number 2275054) is built specifically for 6mm plastic airsoft BBs and fits airsoft models like the MP5 Competition Kit, MP5 SD6, and MP5K. The .177 caliber MP5 K-PDW uses a dedicated steel BB magazine with completely different internal dimensions and feed lips. Always verify that the magazine packaging explicitly specifies .177 caliber steel BBs before buying spares.

Can you power the Umarex MP5 with NitroAir prefilled nitrogen cartridges?

No, you should never attempt to install prefilled nitrogen cartridges into this airgun. Umarex NitroAir cartridges are pressurized to 3,600 psi with 32 grams of nitrogen, engineered exclusively for N2 PCP platforms like the Umarex Komplete NCR. Standard CO2 airguns operate at far lower pressure levels, and exposing a CO2 valve to 3,600 psi nitrogen can cause catastrophic seal rupture and internal valve failure. Stick strictly to standard 12-gram CO2 capsules designed for the platform.

Why does CO2 cartridge cleanliness matter for this semi-automatic airgun?

Clean CO2 cartridges prevent debris and oily residues from fouling the internal valves and puncture seals. The rapid cycling of the Umarex MP5 semi-automatic action depends on consistent gas flow, and low-grade gas cylinders can leave behind particulates that trigger slow leaks. Choosing high-grade capsules formulated to keep valves clean helps preserve valve integrity and maintains dependable cycling. A clean gas source keeps your tactical air rifle replica firing reliably during fast string shooting.

How can you confirm you are buying the BB airgun instead of an airsoft replica?

Check the product title and technical specifications for .177 caliber and steel BB designations. The authentic backyard plinking replica is listed as the Umarex HK Heckler & Koch MP5 K-PDW Semi Automatic .177 Caliber BB Gun Air Rifle. Airsoft variants specify 6mm plastic BBs and mention airsoft kit designations such as the 2275052 Competition Kit or 2275053 SD6. Checking the caliber specification on the box or product page confirms you are getting the steel BB repeater rather than a plastic-firing airsoft replica.