The Arex Delta L OR is a 9mm semi-automatic pistol built on a modular polymer frame with a 4-inch barrel. It ships with a Crimson Trace red dot and optics plates already mounted, plus backup iron sights so it can be run with or without the optic. Interchangeable backstraps let the grip be tailored to the shooter's hand, and the magazine and slide releases are ambidextrous. 
 

Key Specifications 

• Brand: Arex 
• Model: Delta L OR 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17 Rounds 
• Barrel Length: 4 in 
• Material: Polymer 
   

Detailed Features 

• 4-inch class barrel chambered in 9mm 
• Optics-ready slide with a pre-installed Crimson Trace red dot and mounting plates 
• Backup iron sights allow use with or without the optic mounted 
• Interchangeable frame and backstraps for a tailored grip fit 
• Ambidextrous magazine release and slide release controls 
• Modular polymer frame designed to accept the interchangeable backstrap set

Shooters who pick up the Delta L OR often note the 4-inch barrel gives a full-size feel without feeling front-heavy, and the fit and finish typically draws favorable comments for the price point. A few owners mention the trigger needs some rounds through it before it smooths out.

The backup iron sights get praised as a practical touch for anyone running the red dot, since they provide a co-witness option if the optic ever fails or needs to come off. The interchangeable backstraps and ambidextrous controls are consistently called out as thoughtful details that make the pistol comfortable across a range of hand sizes.

On value, having the Crimson Trace red dot and optics plates included is seen by many as a real cost saver versus buying everything separately. Some owners say holster selection for the platform is more limited than for the major established brands, so it takes a little more searching to find a good fit.