The Arex Delta L is a striker-fired semi-automatic pistol chambered in 9mm Luger (9x19 Para). It runs a 4.5-inch barrel, holds 19 rounds, and weighs 1.3 lbs. The slide is finished in black nitride, the frame in Flat Dark Earth polymer. It ships optic-ready with a plate kit and includes interchangeable backstraps for grip sizing. 
 

Key Specifications 

• Caliber: 9MM LUGER (9X19 PARA) 
• Action: Striker Fired 
• Barrel Length: 4.5 inches 
• Capacity: 19 rounds 
• Weight: 1.3 lbs 
• Finish: Black / Flat Dark Earth 
   

Features 

 
The optic-ready slide accepts red dot sights through the included plate kit, covering the common footprints without requiring machine work. Interchangeable backstraps let the shooter dial in grip fit, a useful detail given how much grip angle and circumference affect comfort and control on a striker-fired pistol. 
 
At 1.3 lbs. unloaded, the Delta L is on the lighter end for a full-size 9mm. The black nitride slide finish resists corrosion and surface wear better than basic bluing, and the FDE frame gives it a two-tone appearance that distinguishes it from the standard all-black configuration. 
 

Usage 

 
The 19-round capacity and 4.5-inch barrel make the Delta L suited to range work, recreational shooting, and home defense use. The optic-ready design appeals to shooters who prefer a red dot for faster target acquisition. Aftermarket support for the Delta L is more limited than for established US-market brands, so buyers who plan to heavily customize should verify compatibility before purchase.

Owners of the Arex Delta L most often lead with ergonomics. The grip geometry gets consistent praise for feeling natural in hand, and the weight distribution is noted as comfortable during longer sessions. The 19-round capacity draws favorable comparisons to other 9mm pistols at similar price points.

The optic-ready feature is popular with shooters who run red dots, though a few note that finding compatible plates and aftermarket accessories takes more effort than it would with a Glock or SIG. This is the most commonly cited limitation: the Delta L is not as well-supported in the US aftermarket as the dominant platforms.

Trigger feedback is mixed. Some owners find the pull acceptable out of the box; others want a lighter or crisper break. There are also mentions of a break-in period before the action settles, which is not unusual for new striker-fired pistols but does come up in discussions. Value-for-money sentiment is generally positive. Most buyers feel the feature set justifies the price, particularly given the optic readiness and interchangeable backstraps that cost extra as add-ons on other platforms.