10-8 Performance
GLOCK 21 Gen 2
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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 21 · Gen 2
Mounting details
Glock rear-sight dovetail (standard and Slimline slides)
Compatibility records
125
Sights
Triggers & internals
Triggers
21 listed- Agency Arms
Glock DROP-IN TRIGGERS
Manufacturer documented - Glockmeister
Trigger Black Shoe Black Safety Gen1 - 4
Manufacturer documented - Johnny Glocks
Factory OEM trigger shoe Upgrade (modified & enhanced)
Manufacturer documented - Overwatch Precision
BRZ Trigger for Glock
Manufacturer documented
Recoil Springs
3 listed- DPM Systems
DPM "STANDARD VERSION" For Glock Models: 20-21-21SF Gens 1-2-3
Manufacturer documented - Sprinco
Glock 21 COR-BON Recoil Management System
Manufacturer documented - Sprinco
Glock 21 Recoil Management System
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
Barrels & comps
Barrels
3 listed- KKM Precision
21 Match 45ACP 4.6"OAL (Fits Glock G21 Gen 1-4)
Manufacturer documented - KKM Precision
21 Match 45ACP 6"OAL (Fits Glock G21 Gen 1-4)
Manufacturer documented - KKM Precision
21 Match 45ACP with .578×28 Suppressor Threads 5.2" OAL (Fits Glock G21 Gen 1-4)
Manufacturer documented
Compensators
1 listedAlso on this pistol
Holsters
3 makers- Alien Gear Holsterschecked 2026-11-01
- Galcochecked 2026-11-01
- PHLsterchecked 2026-11-01
Check each manufacturer’s options for your model, light and optic.
Categories with no listings (11)
About the GLOCK 21 Gen 2
- Type
- Pistol
- Manufacturer
- GLOCK
- Model & version
- Glock 21 · Gen 2
- Caliber
- 45 ACP
- Mounting details
- Glock rear-sight dovetail (standard and Slimline slides)
Other versions of the Glock 21
Compare versions and check the details for your exact model.
- GLOCK 21Adds: Glock Accessory Rail.
- GLOCK 21 Gen 3Adds: Glock Accessory Rail.
- GLOCK 21 Gen 4Adds: Glock Accessory Rail.
- GLOCK 21 Gen 5Adds: Glock Accessory Rail.
- GLOCK 21 MOSAdds: Glock MOS, Glock Accessory Rail. Lacks: Glock rear-sight dovetail (standard and Slimline slides).
- GLOCK 21 SFAdds: Glock Accessory Rail.
- GLOCK 21 V MOSAdds: Glock Accessory Rail, Glock MOS. Lacks: Glock rear-sight dovetail (standard and Slimline slides).