8 Umarex Colt Defender Co2 of 2026 For Leak-Free Plinking

1

Guard Dog Security 12 Gram Co2 Cartridges, Non-Threaded, CO2 cartridges

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.4
• Brand
  Guard Dog Security

Key specs2

Cartridge Neck Design

Standard non-threaded 12g

Pack Size

25 non-threaded capsules

Pros & cons32

Pros

• Standard non-threaded 12-gram build matches popular CO2 BB pistols and airsoft markers
• Designed for a snug fit to help achieve a solid neck seal upon piercing
• 25-pack quantity supplies multiple backyard target practice sessions

Cons

• Non-threaded design will not fit airguns or inflators that require threaded cartridges
• Manufacturer does not list overall cylinder dimensions or individual neck tolerances

2

Crosman 25-Count 12-Gram CO2 Cartridges For Air Rifles And Air

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.4
• Brand
  Crosman

Key specs2

Powerlet Compatibility

Designed to seat cleanly in standard 12-gram airgun chambers, delivering consistent gas output for target pistols and air rifles.

Quantity and Capacity

• 25 cartridges per box
• Full 12-gram CO2 fill per capsule

Pros & cons42

Pros

• Built specifically for CO2 air rifles and pistols with full 12-gram capacity
• Engineered for a snug fit and solid seal to reduce lost gas during installation
• Broad compatibility across standard 12-gram airgun platforms
• Pack of 25 capsules provides plenty of fuel for extended shooting sessions

Cons

• Standard non-threaded capsules do not fit threaded inflator or valve designs
• Gas pressure naturally drops during rapid firing cycles due to capsule cooling

3

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

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Umarex

Key specs3

Ammunition Type

.177 caliber lead pellets

Muzzle Velocity

Up to 380 FPS

Frame and Loading

• All-metal frame at 2.0 pounds
• 6-round capacity with reusable pellet casings
• CO2 cartridge installs in grip

Pros & cons43

Pros

• All-metal frame construction delivers realistic handling weight of 2 pounds
• Fires .177 caliber pellets from realistic individual casings at up to 380 fps
• Houses economical 12-gram CO2 cartridges directly inside the pistol grip
• Includes 6 pellet casings and accepts spare cylinder part 2254049

Cons

• Chambered strictly for .177 pellets and cannot feed steel BBs safely
• Six-round cylinder capacity requires manual reloading after every six shots
• Umarex-brand CO2 is recommended for proper seating and is not included

4

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

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Umarex

Key specs3

Ammunition Type

.177 caliber steel BBs

Velocity Rating

Up to 410 FPS

Revolver Mechanism

Uses six individual BB-holding cartridges loaded into an all-metal cylinder, replicating traditional single-action army handling.

Pros & cons43

Pros

• All-metal frame build provides an authentic 2.45-pound handling feel
• Achieves muzzle velocity ratings up to 410 fps using .177 caliber steel BBs
• Realistic six-shooter operation with individual loading BB casings included
• Uses widely available 12-gram CO2 capsules installed directly into the grip

Cons

• Engineered specifically for steel BBs and does not accommodate standard pellets
• Revolver cylinder holds only 6 rounds before requiring casing reloads
• Does not include CO2 cartridges in the box

5

Crosman CC40PB CO2 Powerlet For Paintball (40-Count),Black

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.8
• Brand
  Crosman

Key specs2

Package Quantity

40 Powerlet capsules

Intended Platform

Packaged for paintball equipment; verify cylinder neck size and gram rating before pairing with compact BB pistols.

Pros & cons32

Pros

• Generous 40-count package keeps high-volume shooting sessions fully stocked
• Standard Crosman Powerlet design provides dependable gas for compatible markers
• Crosman brand reliability ensures standard manufacturing dimensions

Cons

• Listing does not state exact gram weight, requiring verification before purchase
• Packaged primarily for paintball markers without explicit airgun warranty claims

6

Colt Defender Semi Automatic Metal Frame .177 Caliber BB Gun

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.6
• Brand
  Umarex

Key specs3

Pistol Action

Semi-automatic BB repeater

Frame Construction

All-metal compact frame

Target Application

Designed for informal backyard plinking and target practice using .177 steel BBs in a compact, durable metal chassis.

Pros & cons42

Pros

• Full metal frame construction offers realistic heft and long-term durability
• Chambered for standard .177 caliber steel BBs for economical backyard plinking
• Semi-automatic action provides quick follow-up shots without manual cocking
• Compact Defender profile replicates the authentic Colt compact handgun footprint

Cons

• Does not fire .177 lead pellets or other pellet ammunition types
• Listing leaves magazine capacity and FPS velocity unstated for model verification

7

Umarex Colt 6" Python .357 Caliber Steel BB C02 Air

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.6
• Brand
  Umarex

Key specs2

Barrel Length

6-inch barrel

Finish and Styling

Powdered black finish over Colt Python styling, optimized for steel BB target practice.

Pros & cons42

Pros

• Long 6-inch barrel configuration aids visual sight alignment downrange
• Rugged powdered black finish over classic Colt Python revolver styling
• Chambered for steel BBs to deliver low-cost target plinking practice
• Powered by standard CO2 capsules for consistent shooting cycles

Cons

• Product title references .357 styling, so buyers must verify it uses .177 steel BBs
• Velocity and cylinder shot capacity are omitted from provided specifications

8

Umarex CO2 Saver Adapter for Airgun 88g CO2 Capsules

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.6
• Brand
  Umarex

Key specs2

Seal Protection

Prevents internal valve seal damage by letting you detach pressurized 88g capsules between shooting sessions without losing gas.

Material and Fit

• Solid aluminum construction with o-ring seals
• Dedicated to 88-gram CO2 airgun capsules
• Allows sharing capsules across airguns

Pros & cons42

Pros

• Lets you remove 88g CO2 capsules without venting or wasting remaining gas
• Prevents o-ring and valve seal degradation caused by leaving pressurized gas stored
• Solid aluminum build with durable o-ring seals ensures dependable pressure containment
• Enables moving a single 88g capsule between multiple compatible airguns

Cons

• Designed strictly for 88g CO2 tanks and does not fit 12g pistol chambers
• Does not include 88g CO2 capsules in the package

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

Does the Umarex Colt Defender shoot steel BBs or lead pellets?

The Colt Defender fires .177 caliber steel BBs. It is built as a semi-automatic metal frame BB gun air pistol, which means it will not feed or fire traditional pellets. Loading lead pellets into the magazine can jam the firing mechanism and damage internal components. Always verify that your ammunition package specifies .177 steel BBs before loading the pistol.

What CO2 cartridge size does the Colt Defender require?

It takes standard non-threaded 12-gram CO2 cartridges. These 12g capsules fit directly into the grip compartment to power each shot. Choosing quality non-threaded cylinders built for air pistols ensures a snug fit and a solid seal against the internal valve, preventing wasted gas before you begin shooting.

How do you stop CO2 from leaking when installing a fresh cartridge?

Place the 12-gram cartridge straight into the grip channel and turn the tightening screw smoothly without pausing. Stopping halfway allows pressurized gas to hiss out and freeze the seal. A swift, steady turn pierces the neck cleanly and locks the cartridge against the internal valve. Always check that the puncture tip seats squarely to protect the internal O-ring from uneven wear.

Is the Colt Defender made of plastic or metal?

The Colt Defender is constructed with a metal frame. That solid metal build gives the semi-automatic air pistol realistic heft in hand and resists exterior wear during repeated backyard plinking. Unlike lightweight plastic models, the metal receiver holds up reliably during routine magazine cycling and regular handling.

Can you store the pistol with a pierced CO2 cartridge inside?

No, you should never store the pistol with a punctured CO2 cylinder locked in the valve. Leaving pressurized gas seated against the internal seal for days crushes the rubber O-rings, leading to leaks during future shooting sessions. When your shooting session wraps up, vent any remaining gas safely and remove the empty cartridge to keep the valve healthy.

How does the Colt Defender compare to revolving Colt air pistols?

The Colt Defender is a semi-automatic BB repeater with an integrated magazine, while models like the Colt Peacemaker revolver use individual cartridges to shoot .177 pellets at up to 380 fps or .177 steel BBs at up to 410 fps. Choosing between them depends on whether you prefer rapid plinking or classic single-action loading. If you are exploring the best CO2 BB gun styles for target practice, the Defender provides faster follow-up shots without loading individual shell casings.