The Glock 20 Gen 4 is a striker-fired pistol chambered in 10mm with a 15-round capacity. The polymer frame keeps weight down at 1.9 lbs unloaded while the Safe Action system handles safety without a manual lever. 
 

Key Specifications 

• Caliber: 10MM 
• Action: Striker-fired 
• Capacity: 15 Rounds 
• Barrel Length: 4.6 inches 
• Weight: 1.9 lbs (unloaded) 
• Total Length: 8.07 inches 
• Total Height: 5.47 inches 
   

Detailed Features 

 
The Safe Action system integrates three passive safeties - trigger, firing pin, and drop - that all disengage together when you pull the trigger. The polymer frame is light and durable; the textured grip holds up under rapid fire. Fixed sights use a single front dot and two rear dots for fast alignment. 
 
The 4.6-inch barrel balances velocity and manageability well for a full-size 10mm. Adjustable backstraps let you fit the grip to different hand sizes, though some shooters with smaller hands still find it a stretch. 
 

Usage Scenarios 

• Home Defense: 15 rounds of 10mm with reliable cycling. 
• Sport Shooting: Accurate and predictable for competition use by shooters comfortable with the round. 
• Field/Hunting Use: The 10mm caliber provides real stopping power for outdoor carry in areas with larger wildlife.

Owners of the G20 Gen 4 generally rate it positively, with a few points that come up repeatedly.

The 10mm caliber is the defining feature, and most buyers chose this pistol for exactly that reason - the stopping power for self-defense or hunting is a genuine advantage. At 15 rounds, the capacity is competitive for a full-size pistol in this caliber. Glock's reliability reputation holds here; owners report consistent function across varied conditions and ammunition types.

Ergonomics get decent marks, but hand size matters more with the G20 than with smaller-framed pistols - the grip is substantial. The adjustable backstraps help but don't resolve it for everyone. Recoil is noticeably more than a 9mm or .40, which some shooters enjoy and others find demanding. The extensive Glock aftermarket means you can customize almost anything. On cost: the pistol itself is competitively priced, but 10mm ammunition runs higher than more common calibers, which is worth factoring into the total cost of ownership.