Hi Christopher, Direct Optic cut for U.S. Optics DRS 2.0 /Vortex (w/purchase of attachment screws) >>> https://zrodelta.com/product/drs-viper-nuts/
This also takes adapter plates. Plates are available for Trijicon RMR , Shield RMS.
Mounting Plate for the RMR is coming soon.
https://zrodelta.com/product/sheild-rms-optic-plate-the-one-slides/
https://zrodelta.com/product/trijicon-rmr-optic-plate-the-one-slides/
This comes with (1) 15rd magazine. The ONE™ Frame Kit is compatible with after-market Gen5 slides and components. Proprietary magazine release and locking block components included.
Stay safe & have a great day!

it uses optics plates see specs *****e 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

SPECIFICATIONS:
9x19mm
Modular Metal Inserted Polymer Frame and Handle
Modular Dust Cover and Magwell
Modular Standard Backstrap
Slide, 6.75”
4140 Precision Match Barrel, 4”
15 Round Capacity Magazine x1
*****Direct Optic cut for U.S. Optics DRS 2.0 (w/purchase of attachment screws) and Modular Plate Options (Coming Soon)
Sights: White Dot Rear/Front
Trigger Pull: 5.5lb
Width: 1.25”
Weight: 21.5 oz (Complete Compact)

Hi Christopher and welcome back. It is Direct Optic cut for U.S. Optics DRS 2.0. It is highly customizable: Details here: https://zrodelta.com/product/the-one-complete-frame-kit/ ---------- Cheers and stay safe!