The Diamondback DB9 G4 is a compact double-action-only 9mm pistol built for concealed carry. At 0.8 lbs and 3.1 inches of barrel, it is one of the lighter options in its class, and the 6+1 capacity keeps bulk down. 
 

Key Specifications 

• Brand: Diamondback 
• Model Name: DB9 G4 
• Caliber: 9mm Luger 
• Action Type: DAO (Double Action Only) 
• Capacity: 6+1 rounds 
• Barrel Length: 3.1 inches 
• Overall Length: 10.8 inches 
• Weight: 0.8 lbs (approximately) 
• Frame Material: Polymer 
• Grip Material: Black Polymer 
• Sights Configuration: 3-Dot sights 
• Safety Feature: Firing Pin Safety 
• Finish Color: Black with Nickel Boron Stainless Steel slide 
   

Detailed Features 

The 3.1-inch barrel keeps overall length down for concealment. The 6+1 capacity is a deliberate tradeoff in favor of a thinner, lighter package. DAO action means a consistent pull on every shot, which suits a carry gun that may sit untouched for long periods. 
 
The black polymer frame is durable and light. The Nickel Boron Stainless Steel slide offers corrosion resistance and runs reliably across different conditions. A firing pin safety is the primary passive safety mechanism.

The DB9 G4 gets the most consistent praise for its size and weight. Shooters who carry all day note that it disappears under a shirt in ways that heavier guns do not, and it fits most holsters intended for sub-compact 9mms.

Performance feedback is more varied. Some owners report clean feeding and ejection from the start; others encounter issues during early use or with specific ammunition brands. Most suggest running several hundred rounds of your intended carry load before trusting it.

The DAO trigger divides opinion. Some carriers prefer the longer, consistent pull as a carry feature; others find the pull weight too heavy for precise target work.

For the price, most users view it as a competitive value among budget-friendly compact 9mms. The main trade-offs acknowledged are the limited capacity and the trigger, rather than the overall package.