ZRODelta ONE modular firearm system

The ZRODelta Modulus® pistol is now the ZRODelta ONE™, a patent-pending, cross-platform modular firearm system. The ONE™ will be available as a modular frame kit or as a pistol.

The foundation of the ONE™ is the Universal Fire Control, or UFC®, which is the firearm and serialized component of the system. The ONE™ UFC® can be detached from the pistol without tools, and married to various non-firearm Platform Conversion Units (PCUs) that expand functionality.

Modular Frame Kits

Starting at $199, The ONE™ Frame Kits include the serialized receiver and all modular frame components of every size. The ONE™ Frame Kits are available in Black, FDE, and Stealth Grey. The ONE™ Frame Kit is compatible with after-market Gen5 slides and components.

Modular Pistols

Starting at $599.99, The ONE™ complete pistol is offered in your choice of Compact, Duty, and Race configurations. The complete pistol includes all modular frame components of every size and is available in Black, FDE, and Stealth Grey.

Platform Conversion Units (PCU)

The ONE™ UFC can be detached from the pistol without tools, and married to various non-firearm Platform Conversion Units (PCUs) that expand functionality. The ONE5 is a patent-pending PCU that marries the ONE™ UFC to off-the-shelf AR15 upper receiver groups and buttstock or pistol brace assemblies.


ZRODelta slide assemblies are manufactured from 17-4PH Stainless Steel and are specially treated to put up with the added rigors of mating with a metal frame. Sleek, distinguished, and reliable beyond a shadow of a doubt, our slide assemblies come complete with barrels, sights, and fire control parts so all you have to do is rack and go.

  • COMPACT: Ideal for everyday carry, our compact slide assemblies feature a 4.01” barrel and have an overall length of 6.85”
  • DUTY: Perfect for on-duty applications, our service-length slides feature a 4.58” barrel and have an overall length of 7.32”
  • RACE: The right choice for competition or extended-range/specialty applications, extended slide assemblies feature a 5.31” barrel and have an overall length of 8.15”


Front and Back Straps are the ergonomic control center of the ONE™. Designed, engineered, and manufactured to fit the widest variety of hand sizes and physiologies, this is where the ONE™ truly becomes personalized to you. Front Straps integrate into a precision forward dovetail machined into the front of the handle. Back Straps, while truly a work of manufacturing art and key to the structural integrity of the handgun frame, slide into the rear of the modular exoskeleton frame and clip into the rear of the handle.

  • FRONT STRAPS: The ONE™ comes standard with both the smooth and finger grooved front straps.
  • BACK STRAPS: The ONE™ comes standard with both the low and high cut back straps.


Dust Covers not only allow the user to change the physical size of the firearm from Compact to Duty to Extended, but also allow the user to swap out handgun accessories like lights and lasers with ease and without losing zero due to our patented design. Should shooters desire to build out The ONE™ configurations with non-ZRODelta slides and barrels, the only part required is the appropriate ZRODelta Dust Cover. All Dust Covers come in your choice of Black, FDE, and Stealth Grey

  • COMPACT: The Compact Dust Cover has 3 Picatinny rail sections.
  • DUTY: The Dusty Dust Cover has 4 Picatinny rail sections.
  • EXTENDED: The Extended Dust Cover has 6 Picatinny rail sections.


3 independent Magazine Wells offer the shooter the ability to balance ergonomics, performance, and firearm specifications. Not only does each Magazine Well allow the shooter to change the magazine capacity of the firearm, each Magazine Well has its own feature set that is purpose-driven and sure to impress.

  • COMPACT: At only 0.63” tall and 2.37” long, the Compact magwell maintains a 0.09” micro-flared base and offers the The ONE™ a 15 round magazine capacity while fitting the widest variety of hand sizes.
  • DUTY: With straight sides that develop into a 0.17” flare, the Duty magwell is 1.28” tall, 2.37” long, and offers The ONE™ a 17 round magazine capacity.
  • RACE: Purpose built for competition, the Extended magwell expands significantly to 1.72” in height, 3.0” in length, and features a 0.35” flare to make magazine changes effortless. The Race magwell is compatible with 17+ round magazines.


The ONE™ is optics ready out of the box! Our recessed slide cut out allows the U.S. Optics DRS 2.0 and 2.0 Enhanced to sit perfectly flush with your factory sights.

  • FLAT PLATE: If you prefer to run your pistol without an optic, ZRODelta offers a flat plate that fits seamlessly on your slide cut out.
  • RMR PLATE: Mounting Plate for the RMR are coming soon!


  • 9x19mm
  • Modular Metal Inserted Polymer Frame and Handle
  • Modular Dust Cover and Magwell
  • Modular Standard Backstrap
  • 17-4PH Slide, Nitride Treated, 6.75”
  • 4140 GBQ CHF Precision Match Barrel, 4”
  • 15 Round Capacity Magazine x1
  • Direct Optic cut for U.S. Optics DRS 2.0 and Modular Plate Options (Coming Soon)
  • Sights: Black Serrated Rear/Front
  • Trigger Pull: 5.5lb
  • Width: 1”

Source: ZRODelta

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