6 Umarex Glock 17 4.5 mm of 2026 For Realistic Practice

1

Umarex Glock 17 Gen3 GBB Blowback 6mm BB Pistol Airsoft

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
  Elite Force

Key specs1

Airsoft Caliber Format

Fires 6mm plastic BBs rather than 4.5 mm steel ammunition, making it suitable for skirmishing rather than hard-target plinking.

Pros & cons32

Pros

• Gas blowback slide action cycles on each pull for realistic handling
• Licensed Glock Gen 3 frame layout matches standard service pistol ergonomics
• Uses widely accessible 6mm plastic airsoft BB ammunition

Cons

• Fires 6mm plastic BBs rather than 4.5 mm (.177) steel target BBs
• Exact gas reservoir type and magazine capacity must be verified before purchase

2

Umarex Glock 45 GBB Blowback 6mm BB Pistol Airsoft 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

  8.8
• Brand
  Elite Force

Key specs1

Glock 45 Profile Distinction

Represents the Glock 45 compact-slide crossover design rather than a Glock 17, and shoots 6mm plastic airsoft projectiles.

Pros & cons32

Pros

• Replicates the crossover Glock 45 compact slide and full-size grip profile
• Gas blowback action provides realistic slide recoil during drills
• Licensed Elite Force Glock trade dress matches real firearm styling

Cons

• Glock 45 crossover model differs in slide length from standard Glock 17 replicas
• Chambered in 6mm airsoft rather than 4.5 mm (.177) steel airgun ammunition

3

Umarex GLOCK 17 Blowback .177 Caliber BB Gun Air Pistol,

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

Velocity and Feed System

• Shoots .177 (4.5 mm) steel BBs up to 365 fps
• 18-shot drop-out all-metal magazine
• Powered by standard 12g CO2 cartridges

Training and Holster Compatibility

Features a full metal slide, official Glock Gen3 markings, and authentic exterior dimensions to fit standard duty holsters.

Pros & cons52

Pros

• True 4.5 mm (.177) steel BB airgun firing at factory ratings up to 365 fps
• Full metal slide with functional blowback provides authentic cycle motion
• Heavy 1.5-pound weight and licensed Gen3 frame fit most duty holsters
• Drop-out metal magazine holds 18 steel BBs alongside the 12g CO2 cartridge
• Fixed Glock-style sights and authentic controls mirror the service sidearm

Cons

• Steel BB compatibility excludes lead pellets and plastic airsoft BBs
• Requires 12-gram CO2 cartridges which are not included in the package

4

GLOCK 17 Blowback .177 Caliber BB Gun Air Pistol, Gen4

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

Gen4 Action Specs

• 18-shot metal drop-out magazine
• Up to 320 fps muzzle velocity
• 12g CO2 blowback cycling

Duty Rig Compatibility

Sized to standard Glock Gen4 dimensions with licensed trademarks, making it compatible with most aftermarket duty holsters.

Pros & cons52

Pros

• Authentic 4.5 mm (.177) steel BB replica built to licensed Gen4 specifications
• Functional CO2 blowback action delivers crisp slide cycling on every shot
• Full metal slide and drop-out metal magazine provide realistic field weight
• Sized to seat correctly in most aftermarket duty holsters for draw practice
• Reaches velocities up to 320 fps using standard 12-gram CO2 cylinders

Cons

• Lower peak velocity rating of 320 fps compared to the 365 fps Gen3 model
• Limited strictly to steel BBs and cannot chamber rifled lead pellets

5

Elite Force Glock 17 Gen5 GBB Blowback 6mm BB Pistol

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
  Elite Force

Key specs1

Generation Profile

Features modern Gen5 frame and slide styling, operating on 6mm airsoft BBs rather than steel 4.5 mm ammunition.

Pros & cons32

Pros

• Modern Glock Gen 5 styling with front slide serrations and flared magwell profile
• Gas blowback cycling provides realistic slide recoil for force-on-force drills
• Officially licensed Elite Force trademarks and accurate external detailing

Cons

• Chambered in 6mm airsoft caliber instead of 4.5 mm (.177) steel BBs
• Detailed gas power source and magazine round count must be verified on the box

6

Umarex Glock 17 Gen4 Blowback 6mm BB Pistol Airsoft 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

  8.4
• Brand
  Elite Force

Key specs2

Airsoft Capacity and Speed

• 23-round drop-free magazine
• Velocity rated up to 335 fps
• Shoots 6mm plastic airsoft BBs

Mechanical Operation

Features realistic field take-down, a metal slide with CO2 blowback action, and authentic Gen4 ergonomics.

Pros & cons42

Pros

• High 23-round magazine capacity allows extended airsoft practice strings
• Full metal slide with realistic take-down procedure and drop-free magazine
• Powered by standard 12-gram CO2 cartridges with speeds up to 335 fps
• Realistic 1.9-pound weight closely mimics a loaded Gen4 duty weapon

Cons

• Built specifically for 6mm plastic airsoft BBs and cannot shoot 4.5 mm steel BBs
• CO2 cartridge is not included and requires Umarex brand for optimal seal

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

Does Umarex make a 45 mm Glock, or does that refer to 4.5 mm steel BBs?

Umarex does not manufacture a 45 mm Glock pistol. The phrase almost always stems from a missing decimal point for 4.5 mm, which is the metric equivalent of .177 caliber, or confusion with the separate Glock 45 handgun model. In the airgun catalog, 4.5 mm refers specifically to .177 caliber steel BB air pistols like the licensed Umarex Glock 17 Gen3 and Gen4 blowback models. Always check the caliber markings on the packaging to ensure you are buying a steel BB gun rather than an airsoft replica or paintball marker.

How do you verify you are buying a 4.5 mm Glock 17 instead of a 6mm airsoft gun?

Check the caliber rating and magazine capacity on the product listing. A 4.5 mm Umarex Glock 17 is designated as a .177 caliber BB air pistol and comes with an 18-shot magazine. In contrast, 6mm airsoft versions, such as the Umarex Glock 17 Gen4 airsoft pistol, list a 23-round capacity for 6mm plastic BBs. Confirming that the specifications list .177 caliber and 18 rounds ensures you get an authentic CO2 BB gun for target practice rather than a lightweight airsoft sidearm.

What is the difference between an Umarex Glock 17 air pistol and a Glock 45?

The Glock 17 and Glock 45 are distinct firearm profiles with completely different replica designs. The Glock 17 is produced as a .177 caliber (4.5 mm) steel BB airgun with realistic blowback action for target shooting. The Umarex Glock 45 in the product line is a 6mm airsoft gas blowback pistol. Buyers who type "Glock 45 mm" frequently confuse the model number 45 with the 4.5 mm caliber size, which can lead to ordering the wrong ammunition and incompatible magazines.

What are the differences between the Umarex Glock 17 Gen3 and Gen4 .177 caliber models?

Both the Gen3 and Gen4 .177 caliber models feature authentic blowback action, fire steel BBs from an 18-shot magazine, and use a single 12-gram CO2 cartridge housed in the drop-out magazine. The differences come down to physical dimensions, weight, and frame styling. The Gen3 model is listed at 1.5 pounds with dimensions of 3 by 8.5 by 10 inches, while the Gen4 model is listed at 1 pound with dimensions of 3.25 by 10.5 by 9.75 inches.

Can you shoot .43 caliber paint or powder balls in a 4.5 mm Umarex Glock 17?

No, you cannot fire .43 caliber projectiles out of a 4.5 mm BB pistol. The Umarex Glock 17 .177 caliber airgun is engineered strictly for 4.5 mm steel BBs. Training projectiles in .43 caliber require a dedicated marker platform, such as the T4E Glock G17 Gen 5, which uses an 8-round magazine built specifically for paint or powder balls and accommodates a 12-gram CO2 cartridge swapped without tools on the field.

Will a Umarex Glock 17 blowback air pistol fit standard Glock duty holsters?

Yes, licensed Umarex Glock 17 blowback air pistols match the external dimensions of the original firearms and fit standard Glock holsters. Rigid outside-the-waistband Kydex holsters designed to accommodate Glock 17 Gen 1 through Gen 5 frames seat the replica securely. If you use a molded retention holster, check the tension screws and verify slide clearance to ensure a clean, snag-free draw during training drills.