The Glock G27 Gen5 is a subcompact .40 S&W pistol with a 3.43-inch barrel, 9+1 capacity, and an overall length of 6.42 inches. It weighs 1.5 lbs (21.91 oz) and carries a black nDLC finish. The striker-fired Safe Action system uses three passive safeties: trigger, firing pin, and drop. 
 

Key Specifications 

• Brand: Glock 
• Model Name: G27 Gen5 
• Caliber: .40 S&W 
• Action Type: DAO (Double Action Only) 
• Capacity: 9+1 rounds 
• Barrel Length: 3.43 inches 
• Overall Length: 6.42 inches 
• Weight: 1.5 lbs (21.91 oz) 
• Finish: Black nDLC 
   

Detailed Features 

• Glock Marksman Barrel (GMB): Precision barrel geometry improves accuracy and shot-to-shot consistency. 
• Modular Backstrap System (MBS): Interchangeable backstraps let shooters adjust grip width for better control. 
• Flared Magazine Well: Speeds up magazine changes under pressure. 
• Ambidextrous Slide Stop and Reversible Magazine Catch: Compatible with both right- and left-handed shooters. 
   
  The three passive safeties operate automatically with no manual lever to engage or disengage. The subcompact frame and .40 S&W chambering make it suitable for concealed carry and law enforcement backup roles. The G27 can accept full-size G22 and G23 magazines with a sleeve adapter for extended use at the range.

Owners of the Glock G27 Gen5 in .40 S&W consistently praise the compact dimensions. The 3.43-inch barrel and subcompact frame disappear well under concealment, which is a primary reason most people choose it.

Stopping power is a recurring topic. .40 S&W carries a reputation for terminal performance that appeals to those prioritizing self-defense effectiveness, and the G27 packages that into a concealable footprint.

Reliability follows the standard Glock pattern: it works across diverse conditions with minimal complaints about malfunctions.

The 9+1 capacity satisfies most users for carry purposes, though some would like more capacity without adding bulk. Recoil management generates the most divided feedback. .40 S&W in a compact frame produces a sharper snap than 9mm, and that's a real tradeoff some shooters find acceptable while others don't.

Ergonomics split opinion along hand-size lines. Smaller hands tend to fit the grip well; larger hands sometimes find it cramped. Aftermarket options for sights, grips, and holsters are widely available, which owners appreciate.