The Arex Delta M OR is a 9mm semi-automatic pistol with a 4-inch barrel, finished in Flat Dark Earth and built optics-ready from the factory. It comes set up for a red dot sight and pairs that cut with a threaded barrel for muzzle devices. The frame uses interchangeable backstrap inserts and ambidextrous controls, so shooters can tune the grip and run the gun from either hand. 
 

Key Specifications 

• Brand: Arex 
• Model: Delta M OR 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 15+1 
• Barrel Length: 4 in 
• Finish: Flat Dark Earth 
   

Detailed Features 

• Optics-ready slide, factory cut for red dot mounting 
• Threaded 4-inch barrel compatible with common muzzle devices 
• Interchangeable frame and backstrap inserts for a custom fit 
• Ambidextrous magazine release and slide release for left- and right-handed shooters 
• Flat Dark Earth finish over the full pistol

Owners of the Delta M OR generally like the ambidextrous controls and interchangeable backstraps, saying the pistol fits a wider range of hand sizes than most striker-fired guns in this class. The optics-ready slide draws praise from shooters who want to add a red dot without a separate milling job, though a few note the initial dot zero takes some patience.

Build quality gets mostly positive marks. Reliability out of the box is the common theme in feedback, with malfunctions described as rare once the pistol is broken in. Some owners mention the trigger has a bit more takeup than pricier competitors, but nobody calls it a dealbreaker.

For range and carry use, the threaded barrel appeals to owners who want a compensator or suppressor option later on. Aftermarket support is still catching up compared to more established polymer pistols, so holster and accessory choices can be more limited early on.