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GLOCK 20 Gen 4

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132 documented listings67 fit unconfirmedBrowse categories ↓

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What the compatibility labels mean
How we knowHow we check compatibility
  • Lab testedFit checked by Firearm Lab for the recorded setup.
  • Documented fitmentSupported by manufacturer, partner, or reviewed community evidence.
  • Interface matchMounting details match, but this exact model and part have not been confirmed to fit together.

Check your exact model and part before ordering. Fitment limits

Model details
Manufacturer
GLOCK
Model & version
Glock 20 · Gen 4
Mounting details
Glock Accessory Rail, Glock rear-sight dovetail (standard and Slimline slides)
Compatibility records
199

Sights

Sights

90 listed
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Lights & rail fitment

Lights & Lasers

57 listed
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Triggers & internals

Triggers

25 listed
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Recoil Springs

5 listed
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Barrels & comps

Barrels

12 listed
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Compensators

2 listed
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Also on this pistol

Holsters

9 makers

Check each manufacturer’s options for your model, light and optic.

Holster makers (9)

Optics & footprint adapters

Optic Plates

6 listed
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Slides

Slides

1 listed
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Grip & magwells

Magazines

1 listed
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Categories with no listings (8)

About the GLOCK 20 Gen 4

Manufacturer listing ↗ · Checked 2026-08-02

Type
Pistol
Manufacturer
GLOCK
Model & version
Glock 20 · Gen 4
Caliber
10mm
Mounting details
Glock Accessory Rail, Glock rear-sight dovetail (standard and Slimline slides)
Width
1.34"
Height
5.51"
Weight
27.51 oz
Slide width
1.12"
Slide length
7.6"
Barrel length
4.61"
Overall length
8.07"

Other versions of the Glock 20

Compare versions and check the details for your exact model.

  • GLOCK 20Same recorded mounting details. Check each part for additional requirements.
  • GLOCK 20 Gen 2Lacks: Glock Accessory Rail.
  • GLOCK 20 Gen 3Same recorded mounting details. Check each part for additional requirements.
  • GLOCK 20 Gen 5 MOSAdds: Glock MOS. Lacks: Glock rear-sight dovetail (standard and Slimline slides).
  • GLOCK 20 SFSame recorded mounting details. Check each part for additional requirements.
  • GLOCK 20 V MOSAdds: Glock MOS. Lacks: Glock rear-sight dovetail (standard and Slimline slides).