11 Umarex Glock 17 Co2 Blowback of 2026 For Realistic Training

1

Glock 17 Gen 5 MOS Half-Blowback 6mm BB Gun Airsoft

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• ARS Mark

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  9.6
• Brand
  Umarex

Key specs2

Optic readiness

The factory slide comes cut for modular optics, allowing direct installation of micro reflex sights for realistic red dot transition drills.

Ammunition & velocity

6mm plastic BBs at up to 320 FPS

Pros & cons42

Pros

• Factory MOS cut accepts micro pistol reflex sights for red dot training
• Uses 6mm plastic BBs suitable for tactical force-on-force training
• Drop-free magazine replicates authentic magazine release drills
• Muzzle velocity reaches up to 320 FPS using a standard 12g CO2 cartridge

Cons

• Half-blowback action provides shorter slide travel than full-blowback slides
• Drop-free magazine capacity is limited to 14 rounds of 6mm BBs

2

Glock 19X Gen5 .177 Caliber BB Gun Air Pistol, Black

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  8.8
• Brand
  Umarex

Key specs2

Slide construction

Full metal slide with blowback action

Magazine capacity

18-round drop-free magazine

Pros & cons32

Pros

• Full metal slide cycles with blowback recoil for realistic handling
• Drop-free magazine holds 18 rounds of .177 steel BBs for target practice
• Semi-automatic firing mechanism allows rapid follow-up shots

Cons

• Compact Glock 19X slide length may not seat properly in standard Glock 17 holsters
• Factory slide does not include an optic mounting cut for reflex sights

3

Umarex Glock 17 Gen3 GBB Blowback 6mm BB Pistol Airsoft

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  8.8
• Brand
  Elite Force

Key specs1

Frame design

Molded Gen 3 finger grooves and textured grip panels match duty pistol ergonomics for consistent weapon handling and holster draws.

Pros & cons32

Pros

• Gas blowback action produces authentic slide cycling for airsoft training
• Gen 3 frame features molded finger grooves and authentic Glock frame styling
• Standard Glock 17 frame sizing fits compatible duty holsters

Cons

• Listing leaves muzzle velocity and magazine capacity unstated
• Slide lacks factory optic mounting plates for micro red dots

4

Umarex Beretta APX .177 Caliber BB Gun Air Pistol, Beretta

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  8.8
• Brand
  Umarex

Key specs2

Muzzle velocity

Up to 395 FPS with steel BBs

Accessory mounting

Integrated Picatinny rail

Pros & cons42

Pros

• Reaches muzzle velocities up to 395 FPS with .177 caliber steel BBs
• Generous 20-shot magazine capacity reduces pauses during target sessions
• Integrated Picatinny accessory rail accepts standard weapon lights
• Metal slide and polymer frame deliver authentic duty-style balance

Cons

• Replicates the Beretta APX frame rather than a Glock grip profile
• Incompatible with standard Glock 17 holsters and Glock magazines

5

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

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  8.6
• Brand
  Umarex

Key specs2

Holster compatibility

Fits most aftermarket duty holsters

Sighting configuration

Equipped with fixed Glock-style iron sights for standard sight picture training without red dot mounting provisions.

Pros & cons42

Pros

• Fits most aftermarket duty holsters for accurate draw-stroke practice
• Full metal slide and drop-out metal magazine provide realistic weight
• Drop-out metal magazine holds 18 rounds of .177 steel BBs
• Officially licensed Glock markings and realistic frame controls

Cons

• Fixed sights cannot be removed to mount pistol reflex optics
• Muzzle velocity tops out at 320 FPS compared to higher-velocity BB models

6

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

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  8.6
• Brand
  Umarex

Key specs2

Muzzle velocity

Up to 365 FPS

Holster compatibility

Fits most aftermarket duty holsters

Pros & cons42

Pros

• Shoots .177 steel BBs at velocities up to 365 FPS
• Full metal slide delivers crisp blowback action on every shot
• Drop-out metal magazine holds 18 BBs and provides realistic heft
• True-to-spec frame profile fits most aftermarket duty holsters

Cons

• Fixed factory sights do not support micro reflex red dot sights
• Gen 3 grip has fixed finger grooves with no interchangeable backstraps

7

Glock 17 Gen 5 MOS Blowback .177 Caliber BB Gun

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  8.6
• Brand
  Umarex

Key specs2

Optic readiness

Features Glock Modular Optic System slide geometry, ready to receive aftermarket reflex sight plates for target acquisition drills.

Feeding system

18-round drop-free magazine

Pros & cons42

Pros

• Factory MOS cut accepts micro pistol reflex sights for red dot drills
• Shoots .177 steel BBs at velocities up to 360 FPS with blowback action
• Drop-free magazine holds 18 BBs and houses the 12g CO2 cartridge
• Gen 5 styling includes straight front grip and front slide serrations

Cons

• Reflex optic and mounting plates are not included in the package
• Rapid cycling cools the CO2 cartridge and can reduce shot velocity

8

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

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  8.6
• Brand
  Umarex

Key specs2

Accessory type

Replacement magazine only

Power source housing

Accommodates a standard 12g CO2 capsule directly inside the magazine body, allowing complete system swaps during tactical drills.

Pros & cons32

Pros

• Enables seamless tactical reload practice without reloading BBs at the line
• Houses both the 12g CO2 cartridge and .177 steel BBs in one unit
• All-metal build provides realistic weight in hand and magazine pouches

Cons

• Sold as a spare magazine accessory only without an airgun pistol
• Designed for Gen 3 blowback models and may not seat in Gen 5 frames

9

Glock 19 Gen 5 MOS .177 Caliber BB Gun Pistol

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  8.4
• Brand
  Umarex

Key specs2

Included optic plates

4 adapter plates included

Frame dimensions

1.34 x 6.89 x 5.39 inches

Pros & cons42

Pros

• Includes 4 modular optics plates to fit nearly any micro pistol reflex sight
• Integrated accessory rail mounts standard tactical lights or lasers
• Drop-free magazine holds 17 steel BBs and houses the CO2 cylinder
• Authentic Gen 5 design features no finger grooves and flared magwell styling

Cons

• Compact Glock 19 slide length does not fit full-length Glock 17 holsters
• Peak velocity tops out at 330 FPS compared to 365 FPS on full-size models

10

Glock 17 Gen 5 MOS Blowback .177 Caliber BB Gun

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  8.0
• Brand
  Umarex

Key specs1

Slide platform

Gen 5 MOS slide profile provides realistic cycling action and factory optic mounting capabilities for duty weapon simulation.

Pros & cons32

Pros

• MOS slide cut allows direct mounting of compatible micro reflex optics
• Full-size Glock 17 frame provides authentic duty pistol hand placement
• Blowback action cycles the slide to simulate recoil between shots

Cons

• Listing leaves velocity, magazine count, and included plates unstated
• Requires confirming optic plate compatibility before ordering reflex sights

11

Glock 17 Gen5 MOS .177 BB Pistol with RDS 8

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  4.0
• Brand
  Umarex

Key specs2

Bundled sighting system

Supplied with an authentic Umarex RDS 8 red dot optic, allowing instant transition from open sights to dot training out of the box.

Peak velocity

Up to 370 FPS with steel BBs

Pros & cons42

Pros

• Bundled Umarex RDS 8 red dot optic provides a complete sighting solution
• Reaches up to 370 FPS muzzle velocity with .177 caliber steel BBs
• 18-round drop-free magazine supports realistic tactical reload practice
• Includes dedicated CO2 tool for fast cartridge changes at the bench

Cons

• Optic requires initial user assembly and mounting onto the slide
• Total package weight of 2 pounds feels slightly heavier than bare pistols

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

Should you choose a .177 steel BB or 6mm airsoft Umarex Glock 17?

Choose based on whether your training requires target plinking or force-on-force tactical practice. The .177 caliber models, including the Glock 17 Gen3, Gen4, and Gen5 MOS blowback versions, feed steel BBs from an 18-round magazine, making them practical for shooting paper targets and steel silhouettes alongside a tactical air rifle setup. If you plan to run force-on-force skirmishes where steel projectiles cannot be safely used, select the 6mm BB airsoft version, which comes in Gen3 blowback and Gen5 MOS half-blowback configurations.

Can you mount a reflex red dot sight to the Umarex Glock 17 blowback slide?

Yes, but only if you select a model built with the Modular Optic System (MOS). Standard Glock 17 Gen3 and Gen4 CO2 blowback slides feature fixed factory sights and a solid metal slide that will not accept optic adapter plates. The Glock 17 Gen 5 MOS blowback pistols come optics-ready right out of the box to accept micro pistol reflex sights, with select packages including an Umarex RDS 8 red dot optic.

Will an Umarex Glock 17 blowback replica fit your standard firearm holster?

It depends on your holster material and whether you choose an optic-ready slide. Because Umarex builds these pistols with authentic Glock Gen3, Gen4, and Gen5 styling, frame dimensions closely track original profiles with pistol weights ranging between 1 and 2 pounds. Leather and universal nylon holsters usually accommodate them without trouble, but rigid molded Kydex duty holsters require careful verification of slide clearance and accessory rail dimensions, especially if you mount a reflex sight to an MOS slide.

What power source does the Umarex Glock 17 blowback use?

Every Umarex Glock 17 blowback pistol is powered by a single 12-gram CO2 cartridge housed directly inside the drop-free magazine. The 12g capsule supplies the pressure needed to propel the BB while cycling the metal slide for authentic recoil feedback. If you practice rapid-fire reload drills with a co2 bb gun, cold gas expansion will gradually lower muzzle velocity from the factory rating of 370 FPS on Gen5 models, so allow the magazine to warm between strings for consistent slide cycling.

What is the functional difference between half-blowback and full-blowback models?

The primary differences are slide travel distance and gas consumption. Full-blowback models, such as the Glock 17 Gen4 .177 air pistol and Gen3 6mm airsoft gun, cycle the metal slide fully rearward to provide maximum felt recoil and lock back on an empty magazine. The Glock 17 Gen 5 MOS 6mm half-blowback version shortens the slide cycle, directing a higher proportion of each 12-gram CO2 charge toward shot velocity while still delivering physical cycling feedback.

Are magazines interchangeable between different Umarex Glock 17 generations?

No, you must match replacement magazines to the exact generation and caliber of your pistol. An Umarex Glock 17 Gen3 spare magazine is engineered specifically for Gen3 .177 BB air pistols, whereas Gen4 and Gen5 drop-free magazines utilize distinct internal valves and mag-catch geometries. Also, 6mm airsoft magazines cannot chamber .177 steel BBs, so verify the caliber and generation stamped on your frame before purchasing spare magazines.