10-8 Performance
GLOCK 21 Gen 5
Explore parts, discover makers and check what fits your model.
Only you can see your saved models.
Choose a part to see sources and fitment details.
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 21 · Gen 5
Mounting details
Glock Accessory Rail, Glock rear-sight dovetail (standard and Slimline slides)
Compatibility records
185
Sights
Lights & rail fitment
Triggers & internals
Triggers
24 listed- Agency Arms
Glock DROP-IN TRIGGERS
Manufacturer documented - Glockmeister
Trigger Black Shoe Black Safety Gen5
Manufacturer documented - Johnny Glocks
Factory OEM trigger shoe Upgrade (modified & enhanced)
Manufacturer documented - Overwatch Precision
BRZ Trigger for Glock
Manufacturer documented
Recoil Springs
1 listed- DPM Systems
DPM Adjustable Recoil System for Glock 20-21 Gen 5 & 20 - 21 V MOS
Manufacturer documented
Optics & footprint adapters
Optic Plates
7 listed- Aimpoint
ACRO Rear Sight Adapter Plate for GLOCK
Interface match - C&H Precision
Fits GLOCK Rear Dovetail Adapter Holosun 407K / 507K / C&H EDC / EDC Enclosed / Olight Osight S STEEL
Interface match - Outerimpact
Red Dot Mount – MRA for Glock
Interface match - Shield Sights
Low Profile Slide Mount for GLOCK 21
Manufacturer documented
Also on this pistol
Holsters
5 makers- Concealment Expresschecked 2026-11-01
- Galcochecked 2026-11-01
- PHLsterchecked 2026-11-01
- Vedder Holsterschecked 2026-11-01
- We The People Holsterschecked 2026-11-01
Check each manufacturer’s options for your model, light and optic.
Barrels & comps
Barrels
3 listed- KKM Precision
Gen5 21 Match 45ACP 4.6"OAL (Fits Glock G21 Gen5)
Source needs review - KKM Precision
Gen5 21 Match 45ACP 6"OAL (Fits Glock G21 Gen5)
Source needs review - KKM Precision
Gen5 21 Match 45ACP with .578×28 Suppressor Threads 5.2" OAL (Fits Glock G21 Gen5)
Source needs review
Compensators
1 listedSlides
Grip & magwells
Magazines
1 listedCategories with no listings (8)
About the GLOCK 21 Gen 5
- Type
- Pistol
- Manufacturer
- GLOCK
- Model & version
- Glock 21 · Gen 5
- Caliber
- 45 ACP
- Mounting details
- Glock Accessory Rail, Glock rear-sight dovetail (standard and Slimline slides)
- Width
- 1.38"
- Height
- 5.51"
- Weight
- 25.93 oz
- Slide width
- 1.12"
- Slide length
- 7.52"
- Barrel length
- 4.61"
- Overall length
- 8.07"
Other versions of the Glock 21
Compare versions and check the details for your exact model.
- GLOCK 21Same recorded mounting details. Check each part for additional requirements.
- GLOCK 21 Gen 2Lacks: Glock Accessory Rail.
- GLOCK 21 Gen 3Same recorded mounting details. Check each part for additional requirements.
- GLOCK 21 Gen 4Same recorded mounting details. Check each part for additional requirements.
- GLOCK 21 MOSAdds: Glock MOS. Lacks: Glock rear-sight dovetail (standard and Slimline slides).
- GLOCK 21 SFSame recorded mounting details. Check each part for additional requirements.
- GLOCK 21 V MOSAdds: Glock MOS. Lacks: Glock rear-sight dovetail (standard and Slimline slides).