4 Best Custom Glocks of 2026 For Optics and Lights

1

Glock 19 Gen3 .177 Caliber BB Gun Air Pistol

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• 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

  9.0
• Brand
  Umarex

Key specs2

Maximum Velocity

Up to 410 FPS

Accessory Mounting

The integrated Weaver rail provides a standard mounting point beneath the barrel for tactical pistol lights and accessories.

Pros & cons33

Pros

• Shoots up to 410 FPS for the highest listed muzzle velocity in this lineup
• Integrated Weaver rail accommodates standard tactical weapon lights and accessories
• Compact 7.25-inch overall frame length matches standard compact handling

Cons

• Fixed sights prevent mounting a micro red dot sight directly to the slide
• Holds 15 rounds which is lower capacity than the 17- and 18-shot alternatives
• Does not feature blowback action to simulate slide movement during drills

2

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

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• 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

  7.8
• Brand
  Umarex

Key specs2

Duty Holster Fit

Fits most aftermarket duty holsters

Slide Construction

Built with a full metal slide, drop-out metal magazine, and realistic controls that cycle via CO2-powered blowback action.

Pros & cons42

Pros

• Fits most aftermarket duty holsters for realistic draw stroke practice
• Realistic blowback action and full metal slide simulate authentic cycling
• Generous 18-shot drop-out metal magazine supports reload drills
• Produces up to 365 FPS velocity from a standard 12-gram CO2 cartridge

Cons

• Fixed Glock-style sights lack optic cutouts or adapter plate support
• Full-size frame dimensions may not fit holsters molded strictly for compact slides

3

Glock 19 Gen 5 MOS .177 Caliber BB Gun Pistol

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• 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

  7.6
• Brand
  Umarex

Key specs2

Optics Readiness

• Modular Optics System (MOS) slide design
• Includes 4 optic mounting plates in the package
• Fits nearly any micro pistol optic on the market

Accessory Mounting

Integrated accessory rail for lights

Pros & cons43

Pros

• Includes 4 MOS adapter plates to mount standard micro red dot sights
• Integrated accessory rail accepts standard weapon lights and laser units
• Drop-free magazine holds 17 steel BBs and houses the 12-gram CO2 power source
• Gen 5 frame profile mirrors standard compact carry gun dimensions

Cons

• Velocity peaks at 330 FPS which is lower than the other models
• Slide blowback action is not specified in the manufacturer data
• Duty holster compatibility is unlisted and must be verified before purchase

4

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

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• 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

  7.3
• Brand
  Umarex

Key specs2

Slide Construction

Full metal slide with blowback action

Magazine Capacity

18-round drop-free magazine

Pros & cons43

Pros

• Full metal slide with blowback action provides realistic semi-auto cycling
• Drop-free magazine holds up to 18 rounds for realistic tactical reloads
• Solid 1.7-pound weight provides authentic handling and balance in hand
• Authentic tan color scheme replicates the official military-style 19X configuration

Cons

• Listing does not include MOS optic plates or a slide cut for micro red dots
• Muzzle velocity is omitted from the product details and requires verification
• Accessory rail dimensions are not specified in the manufacturer data

Last update on 2026-09-19 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Which Glock replica includes MOS plates to mount a micro red dot?

The Glock 19 Gen 5 MOS BB pistol is built specifically for optics, featuring Modular Optics System mounting with 4 included optics plates. This factory configuration allows you to mount nearly any micro pistol optic on the market directly to the slide. Fixed-sight alternatives like the Glock 19 Gen3 do not feature slide cuts, so you cannot attach red dot plates without factory MOS support.

Will tactical weapon lights fit the integrated accessory rail?

Yes, models equipped with an integrated accessory rail accept standard tactical lights. The Glock 19 Gen 5 MOS features an integrated accessory rail designed to carry lights or other forward accessories. Before choosing an aftermarket weapon light, check your light clamp spacing against the rail profile to confirm a secure fit.

Which models feature realistic blowback action for tactical drills?

Both the Umarex GLOCK 17 Gen3 and the Glock 19X Gen5 feature realistic blowback action that cycles the slide during fire. The Glock 19X Gen5 also includes a full metal slide to reproduce authentic slide mass and handling. Non-blowback options like the standard Glock 19 Gen3 keep the slide stationary during firing, making blowback models the preferred option for practicing weapon manipulation and sight tracking.

Will these replica pistols fit into standard aftermarket duty holsters?

Holster fit depends on exterior frame measurements and installed accessories. The Glock 19 Gen 5 MOS lists dimensions of 1.34 by 6.89 by 5.39 inches, while the Glock 19 Gen3 measures 7.25 by 1.7 by 5.75 inches. Because optics plates and rail-mounted lights alter the exterior profile, verify holster tension and optic hood clearances against your specific setup to prevent binding on the draw stroke.

What power source do these training pistols use?

These air pistols run on a standard 12-gram CO2 cartridge, which is not included in the package. Models like the 15-shot Glock 19 Gen3 and the 18-shot Umarex GLOCK 17 Gen3 use this cartridge to drive .177 caliber BBs. Using dedicated CO2 platforms allows you to practice low-cost target transitions alongside your primary combat shotgun for home defense without burning through live ammunition.

How does magazine capacity compare between models?

Magazine capacities differ based on the frame design. The full-size Umarex GLOCK 17 Gen3 holds an 18-shot magazine for .177 caliber BBs, while the compact Glock 19 Gen3 features a 15-shot capacity. Tracking round counts during rapid-fire drills helps build muscle memory that transfers directly to running courses featured in our 3 gun competition gear guide.