The Arex Delta X OR is a 9mm semi-automatic pistol with a 4-inch threaded barrel and a factory optics-ready slide. It ships with a Crimson Trace red dot and multiple optic mounting plates so the sighting setup can be dialed in for the intended use. Interchangeable frame backstraps fit a wider range of hand sizes, and the magazine and slide releases are ambidextrous for left- or right-handed use. 
 

Key Specifications 

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

Detailed Features 

• 4-inch threaded barrel accepts compatible muzzle devices 
• Optics-ready slide comes with a Crimson Trace red dot and multiple mounting plates 
• Interchangeable frame and backstraps adjust to different hand sizes 
• Ambidextrous magazine release and slide release for left- or right-handed shooters 
• Polymer grip frame for a lightweight, secure hold

Owners describe the Delta X OR as handling well for a 9mm built around a factory optic-ready cut, with reports of a crisp trigger and reliable cycling once the pistol is broken in. A few mention wanting more range time before fully trusting it for daily carry, which is common with a newer platform.

The threaded barrel is popular with owners who want the option to run a suppressor or compensator without sending the gun out for gunsmithing, and the ambidextrous controls again draw praise from left-handed shooters. The polymer grip is generally described as secure without feeling bulky in the hand.

On value, bundling the Crimson Trace red dot with multiple mounting plates is seen as a strong deal relative to buying an optic and plates separately. As with other Arex models, holster and aftermarket parts availability lags behind the bigger established brands, so patience is sometimes needed to find compatible gear.