The Arex Delta L OR is a 9mm semi-automatic pistol built with an optics-ready slide that ships with a Crimson Trace red dot and mounting plates already installed. The frame uses interchangeable backstraps so shooters can adjust the grip to fit their hand, and the controls are ambidextrous for use by right- or left-handed shooters. It comes with a 17-round magazine and an extended 17+2 magazine for added capacity. 
 

Key Specifications 

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

Detailed Features 

• Optics-ready slide comes pre-fitted with a Crimson Trace red dot and multiple mounting plates 
• Interchangeable frame backstraps allow the grip to be sized to the shooter's hand 
• Ambidextrous magazine release and slide release work for right- or left-handed shooters 
• Polymer grip frame keeps the pistol lightweight while providing a secure hold 
• Ships with a standard 17-round magazine plus an extended 17+2 magazine

Owners of the Delta L OR tend to describe the build as solid for a striker-fired pistol in this price range, with a smooth trigger and slide that lock up tightly. Some new shooters compare the fit and finish favorably against pricier options, though a handful mention wanting a break-in period before the action feels fully smooth.

In hand, the interchangeable backstraps get credit for letting a wider range of grip sizes find a comfortable hold, and the ambidextrous controls are popular with left-handed shooters who often get overlooked by other makers. The included optic and mounting plates save a step for anyone planning to run a red dot from day one, though a few owners note they would have liked more plate options in the box.

On value, buyers frequently point out that having a red dot bundled with the pistol keeps the effective cost down compared to buying the optic separately. Holster and aftermarket accessory availability is still catching up to more established platforms, so some Delta L owners have had to search longer for gear that fits.