DPP Doesn't Always Fit: DeltaPoint Pro Optics Footprint Compatibility

Published on August 8, 2024
Duration: 23:34

This video details the complexities of mounting pistol-style optics, specifically those with a DeltaPoint Pro (DPP) footprint, onto various firearms and mounts. The presenter highlights that despite sharing a common footprint, optics and mounts often have compatibility issues due to variations in deck height, recoil lug dimensions, and mounting plate designs. The core problem is achieving usable co-witness with backup iron sights, which is frequently hindered by optics with excessive deck height or mounts that don't properly interface with the optic's recoil lugs.

Quick Summary

DeltaPoint Pro footprint optics can encounter fitment problems due to variations in optic deck height and the design of recoil lugs and bosses on both the optic and the mounting plate. Even if the footprint matches, differences in these dimensions can prevent proper installation or a secure mount, impacting the ability to achieve co-witness with iron sights.

Chapters

  1. 00:00Introduction: Optic Mounting Nightmare
  2. 00:57Sponsor: Midway USA
  3. 01:21The Problem: M&P 10mm Performance Center
  4. 02:23Vortex Defender XL Optic Choice
  5. 02:54Suppressor Height Sights Purpose
  6. 03:38The Included 6A Plate
  7. 04:01No Co-Witness with Defender XL
  8. 04:46DeltaPoint Pro vs. Defender XL Deck Height
  9. 05:03The Rabbit Hole Begins
  10. 05:30DPP Compatible Optics Collection
  11. 06:13Deck Height Comparison
  12. 06:59DeltaPoint Pro Deck Height
  13. 07:15Vortex Defender XL Deck Height
  14. 07:44Holosun SCS 320 Deck Height
  15. 08:26SIG Romeo X Pro Deck Height
  16. 09:21The Romeo X Pro Fitment Issue
  17. 09:45Recoil Lug Hole Mismatch
  18. 10:48Sig Legion P229 Example
  19. 11:20Only Option: Holosun SCS 320
  20. 11:36DPP Mount Variations
  21. 12:17Mount Recoil Lug Differences
  22. 14:05Scope Mount Clearance Issues
  23. 15:09DPP Mounts & Optics: The Problem
  24. 16:29The Solution Dilemma
  25. 17:08Presenter's Solution: SCS 320 on M&P 10mm
  26. 18:01Presenter's Solution: Romeo X Pro on P229
  27. 19:01Presenter's Solution: DPP on Beretta
  28. 19:06Presenter's Solution: Vortex on Sig
  29. 19:14Optic Button Ergonomics
  30. 20:45Manufacturer Solutions
  31. 21:04Standardization Idea
  32. 22:15The M&P 10mm Plate Dilemma Recap
  33. 22:34Final Thoughts & Takeaways
  34. 23:21Outro

Frequently Asked Questions

Why do DeltaPoint Pro footprint optics sometimes not fit correctly?

DeltaPoint Pro footprint optics can have fitment issues due to variations in optic deck height, the size and placement of recoil lug holes on the optic, and the design of the mounting plate's recoil bosses. These differences mean an optic designed for the DPP footprint might not interface correctly with a specific mount, preventing proper installation or secure seating.

What is deck height and why is it important for pistol optics?

Deck height refers to the vertical distance from the optic's mounting surface to its optical center. It's crucial for achieving co-witness with backup iron sights. Optics with higher deck heights may obscure the iron sights, while lower deck heights are more likely to allow for a usable sight picture through the optic.

What are recoil bosses and how do they affect optic mounting?

Recoil bosses are raised features on a mounting plate that fit into corresponding recesses or lug holes on the underside of an optic. They help align the optic and absorb recoil forces, preventing movement and ensuring a more stable platform. If the optic's lug holes are too small or absent, they won't engage with the bosses, leading to a loose or unmountable optic.

Which pistol optics with a DeltaPoint Pro footprint have the lowest deck height?

Based on testing, the SIG Romeo X Pro has the lowest deck height at approximately 0.416 inches, followed by the Holosun SCS 320 at 0.516 inches. The Vortex Defender XL is taller at 0.656 inches, and the DeltaPoint Pro itself is the tallest at 0.816 inches. Lower deck heights are generally better for co-witness.

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