The GSG Firefly is a .22 LR semi-automatic pistol in olive drab, built on a zinc alloy frame with a polymer overmold. It holds 10+1 rounds and weighs 1.54 lbs (24.6 oz) with a 4.9-inch barrel. 
 

Key Specifications 

• Brand: GSG 
• Model Name: Firefly 
• Caliber: .22 LR 
• Action: Single/Double Action 
• Capacity: 10+1 rounds 
• Barrel Length: 4.9 inches 
• Weight: 1.54 lbs (24.6 oz) 
• Finish Color: Olive Drab Green 
• Frame Material: Zinc Alloy with Polymer Overmold 
• Slide Material: Zinc Alloy 
• Sights: 3-Dot Adjustable Rear 
• Grip Material: Black Polymer 
• Safety Features: Ambidextrous Thumb Safety 
   

Detailed Features 

The Firefly ships with a threaded barrel (M9 x .75), so a suppressor or muzzle device can be attached without modification. The adjustable rear sight allows for windage and elevation corrections without tools. 
 
The ambidextrous thumb safety works equally well for right- and left-handed shooters. The zinc alloy frame is heavier than polymer alternatives but stays within the 1.54 lb overall weight. The SA/DA trigger system gives flexibility for different shooting preferences. 
 

Target Audience 

New shooters learning the fundamentals, experienced shooters who want an affordable .22 LR training pistol, and hunters or pest controllers who need a light, quiet-capable option for small game. 
 

Usage Scenarios 

1. Target Shooting: The adjustable sights and 4.9-inch barrel support accurate practice. 
2. Plinking: .22 LR keeps ammo costs low for casual range sessions. 
3. Small Game Hunting: The threaded barrel and .22 LR caliber make it suitable for quiet use with a suppressor.

The GSG Firefly in olive drab gets generally positive reviews from shooters who want an affordable .22 LR pistol. The lightweight build and threaded barrel are the most-mentioned positives -- getting suppressor-ready capability at this price point is unusual.

The trigger pull gets the most criticism. Some owners find it heavier than expected, which takes adjustment for precise shooting. Ammunition sensitivity is the other recurring issue -- the Firefly runs well with standard velocity and quality .22 LR but some brands cause occasional feeding or ejection problems. High-velocity or bulk rimfire ammo is less consistent.

Value for money is a common positive theme. Most owners see it as a capable practice and plinking gun at an accessible price, and those who buy it for that purpose are usually satisfied.