10 Umarex Airgun Glock 17 Gen 5 of 2026 For Holster And Optic Drills

1

Glock 17 Gen 5 MOS Magazine for .177 Caliber BB

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• ARS Mark

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  10.0
• Brand
  Umarex

Key specs2

Ammunition Compatibility

.177 caliber steel BBs only

Platform Match

Designed for the Umarex Glock 17 Gen 5 MOS blowback BB platform. Check the baseplate release and valve seal before staging multiple spares for reload drills.

Pros & cons32

Pros

• Dedicated replacement magazine tailored specifically for the Glock 17 Gen 5 MOS BB pistol
• Enables rapid magazine reload drills without stopping to reload loose BBs
• Houses .177 caliber steel BBs to keep the blowback slide cycling during practice

Cons

• Does not accommodate .177 lead pellets or .43 caliber paintballs
• Magazine capacity and CO2 loading style are unlisted and must be confirmed prior to purchase

2

T4E Glock 17 Gen 5 .43 Caliber Paintball Gun Marker,

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  8.8
• Brand
  T4E

Key specs3

Training Ammo Type

.43 caliber paint or powderballs

Holster Compatibility

Built to Glock factory exterior dimensions, allowing direct fitment in most standard duty holsters without snagging on the front serrations.

Slide and Frame Construction

• CNC-machined AW 7075 aluminum slide
• Polymer frame compatible with factory backstraps
• Ambidextrous slide stop lever and reversible catch

Pros & cons42

Pros

• CNC-machined AW 7075 aluminum slide delivers authentic blowback cycling
• Ambidextrous slide stop lever and reversible release match Gen 5 handling
• Polymer frame accepts original backstraps and fits most standard duty holsters
• Tool-free CO2 compartment swap speeds up 12-gram cartridge changes

Cons

• Restricted to 8-round capacity in .43 caliber paint or powderballs
• Incompatible with standard .177 steel BBs or lead pellets

3

Glock 19 Gen3 .177 Caliber BB Gun Air Pistol

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  8.8
• Brand
  Umarex

Key specs2

Muzzle Velocity

Up to 410 FPS

Accessory Mounting

An integrated Weaver rail under the dust cover accepts compact weapon-mounted lights or laser units for basic holster draw practice.

Pros & cons42

Pros

• Delivers up to 410 FPS muzzle velocity with standard .177 steel BBs
• Integrated Weaver rail accommodates compact weapon lights or accessories
• Carries 15 rounds of steel BBs in a compact frame profile
• Fixed Glock-style sights provide a familiar sight picture for target shooting

Cons

• Lacks the blowback action found on higher-tier Gen 4 and Gen 5 models
• Fixed sights offer no optical cut for mounting micro reflex red dots

4

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

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  8.6
• Brand
  Umarex

Key specs2

Slide Mechanism

Full metal blowback action

Holster Fitment

Exterior dimensions replicate the service Glock 17, fitting standard duty retention rigs for consistent draw stroke repetition.

Pros & cons42

Pros

• Realistic blowback action cycles the full metal slide with each shot
• Drop-out metal magazine holds 18 steel BBs alongside the 12-gram CO2 capsule
• Exterior dimensions fit most aftermarket duty holsters for authentic draw practice
• Gen 4 frame texture and authentic controls mimic the centerfire sidearm

Cons

• Listed velocity tops out at 320 FPS, lower than non-blowback BB pistols
• Factory slide lacks optics cutouts for red dot sight installation

5

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

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  8.6
• Brand
  Umarex

Key specs2

Gen3 Frame Ergonomics

Retains the classic Gen 3 finger grooved grip along with standard Glock-style sights and a functional slide release.

Velocity Rating

Up to 365 FPS

Pros & cons42

Pros

• Attains up to 365 FPS while retaining authentic cycling blowback
• Full metal slide and 1.5-pound weight create realistic handling feel
• Drop-out metal magazine feeds 18 rounds of .177 steel BBs
• Fits most aftermarket duty holsters for live holster presentation drills

Cons

• Lacks the Modular Optic System cut found on newer Gen 5 airguns
• Gen 3 frame finger grooves cannot be altered or removed for smaller grips

6

Glock 17 Gen 5 MOS Blowback .177 Caliber BB Gun

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  8.4
• Brand
  Umarex

Key specs2

Optic Readiness

Slide cutout supports pistol red dot sights for transition drills. Verify adapter plate footprint requirements before mounting your chosen reflex sight.

Spare Magazine Part

Part number 2255220

Pros & cons42

Pros

• Factory MOS slide cut accepts pistol-style micro reflex red dot sights
• Blowback slide action delivers realistic cycling feel for training drills
• Drop-free 18-round metal magazine uses standard part number 2255220
• Reaches up to 360 FPS muzzle velocity with standard .177 steel BBs

Cons

• Mounting adapter plates are not explicitly listed as included in the box
• Smoothbore BB barrel is not designed to fire .177 lead pellets

7

Glock 19 Gen 5 MOS .177 Caliber BB Gun Pistol

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  8.2
• Brand
  Umarex

Key specs2

Included Optic Plates

• Factory kit includes 4 optics plates
• Compatible with popular micro pistol footprints
• Direct mount to Gen 5 slide cut

Compact Spare Magazine

Part number 2255231 (17-shot BB)

Pros & cons42

Pros

• Includes 4 optics adapter plates to mount major micro reflex sights out of the box
• Compact Gen 5 frame features an integrated accessory rail for lights
• Drop-free 17-round magazine houses both .177 steel BBs and the 12-gram CO2
• Lists exact spare magazine part number 2255231 to prevent ordering errors

Cons

• Shoots at a maximum listed velocity of 330 FPS
• Compact 19 frame length does not match full-size Glock 17 holsters perfectly

8

Glock 17 Gen 5 MOS Blowback .177 Caliber BB Gun

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  7.6
• Brand
  Umarex

Key specs1

Configuration Check

Confirm whether this MOS listing bundles optic adapter plates or requires purchasing model-specific mounting plates separately before installing an optic.

Pros & cons32

Pros

• Full-size Glock 17 Gen 5 blowback frame matches authentic duty pistol handling
• Factory MOS slide cut provides mounting capability for reflex red dots
• Fires standard .177 caliber steel BBs for economical backyard target practice

Cons

• Listing does not state included adapter plates or spare magazine part numbers
• Velocity and magazine capacity must be verified directly with the seller

9

Umarex GLOCK 17 Gen 5 21-Round Magazine for Blowback .177

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  6.6
• Brand
  Umarex

Key specs2

Ammunition Type

.177 caliber pellets only

Pellet Feeder Compatibility

Designed strictly for the .177 pellet-firing Glock 17 Gen 5 blowback air pistol. Loading steel BBs into this belt-feed or rotary system will cause feed jams.

Pros & cons32

Pros

• High-capacity rotary design holds up to 21 rounds of .177 caliber lead pellets
• Engineered specifically for the blowback pellet version of the Glock 17 Gen 5
• Provides quick-reload capability to extend uninterrupted shooting sessions

Cons

• Incompatible with steel BB models like the standard MOS BB pistol
• CO2 cartridge installation and valve mechanism must be confirmed on product packaging

10

Glock 17 Gen 5 MOS .177 Caliber BB Gun Pistol

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  4.0
• Brand
  Umarex

Key specs1

Magazine Fitment

Intended specifically for the Gen 5 MOS BB variant. Verify whether your airgun uses drop-free CO2 housing or a separate stick magazine setup.

Pros & cons32

Pros

• Official Umarex replacement magazine built for the Glock 17 Gen 5 MOS BB gun
• Enables realistic tactical reload drills without emptying your primary mag
• Proper feed lip geometry ensures reliable chambering of .177 steel BBs

Cons

• Does not function in older Gen 3 or Gen 4 Glock air pistols
• Exact round capacity and part number stamping are unlisted in the description

Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does the Umarex Glock 17 Gen 5 MOS take pistol red dots?

Yes. The Glock 17 Gen 5 MOS blowback BB pistol features factory optics-ready slide machining engineered to accept standard pistol-style reflex sights. The Modular Optics System configuration allows you to mount micro red dots for realistic optic drills without custom slide alterations. Always check your specific reflex sight footprint against available adapter plates before mounting your optic.

What is the difference between the .177 BB pistol and the .43 caliber marker?

The core difference comes down to projectile caliber and your specific training application. The T4E Glock 17 Gen 5 is an officially licensed paintball marker featuring an 8-round magazine that chambers .43 caliber paintballs or powderballs for force-on-force exercises. The standard Glock 17 Gen 5 airgun discharges .177 caliber steel BBs for target practice. If you want an authentic handgun platform for target drills and holster draws, checking a dedicated CO2 BB gun ensures you select the correct metal-projectile platform instead of a marking marker.

Can you use pellet magazines in the Glock 17 Gen 5 MOS BB gun?

No. The Glock 17 Gen 5 MOS blowback BB pistol requires a dedicated .177 caliber BB magazine and will not function with pellet magazines. Umarex offers a distinct 21-round magazine built specifically for blowback .177 caliber pellet pistols, which relies on a completely different internal feed system. Always confirm whether the replacement magazine packaging specifies .177 BBs or .177 pellets before ordering spares.

What power source operates the Umarex Glock 17 Gen 5 airgun?

The airgun runs on a single 12-gram CO2 cartridge housed directly inside the drop-free magazine. This cartridge supplies the gas pressure needed to drive the projectile and cycle the slide for realistic blowback operation with every trigger pull. Because 12-gram CO2 capsules are not included with the air pistol, you will need to purchase standard powerlets separately to run your practice sessions.

How does the Gen 5 MOS model differ from the Gen 3 and Gen 4 airguns?

The primary functional upgrade on the Gen 5 MOS is the factory-machined slide cut that accommodates micro reflex sights. In contrast, earlier variations like the Gen 3 and Gen 4 blowback .177 pistols utilize solid slides with fixed iron sights and 18-shot BB magazines. If you run both handgun and long-gun training sessions, pairing this optics-ready sidearm with a tactical air rifle gives you consistent modern sighting systems across your entire training setup.

Will the Umarex Glock 17 Gen 5 fit standard duty holsters?

It depends on the holster molding, weapon-light setup, and retention style. The Glock 17 Gen 5 MOS blowback airgun has a listed weight of 1 pound and incorporates official Gen 5 frame lines, allowing it to seat properly in many open-top leather and Kydex holsters made for full-size Glock frames. However, rigid duty rigs with active retention hoods can bind against mounted red dot optics or specific slide contours, so measure your holster clearance before beginning rapid-draw practice.