RDO SCREWS: WHAT SCREWS ARE USED TO MOUNT MY LTT LOW RDO PLATE OR OPTIC?

As of August 2025, torque spec for RDO screws is now 15 in-lbs. due to a tool change. 

The Plate-to-Slide attachment screws are size M3-0.5mm x 6mm.

For Optic-to-Plate screw sizes, see below:

• Trijicon RMR Footprint: Fits the Trijicon RMR, SRO, and Holosun 407c, 507c, 508T family of optics.
  • For attaching a Holosun to the RDO Plate use: 4x40 – 5/16
  • For attaching an RMR or SRO to the RDO Plate use: 4x40 – 3/8
• Holosun 509T: Holosun to the RDO Plate use: 4x40 – 5/16
• Doctor Optic: Doctor to RDO Plate use: 4x40 - 3/8 or 4x40 - 5/16
• Delta/Romeo: Delta/Romeo to RDO Plate use: 4x40 - 1/2
• EPS: EPS to RDO plate use: 4x40 - 5/16

All LTT LOW RDO Optic Cut mounting screws should be torqued to 15-inch pounds using a hand-driven torque wrench or torque driver.

The plate-to-slide screw uses a T10 Torx Bit, and the optic-to-plate screw uses a 1/16" hex key.

Please note, when installing an ACRO, MPS or 509T, please follow the optic manufactures factory torque spec when installing on our plates.