LANTAC RPS Ratchet Plate System End Plate & Castle Nut

The LANTAC RPS Ratchet Plate System replaces the standard end plate and castle nut on AR-15 platforms to provide a retained, non-staked solution for securing the buffer tube assembly. It incorporates a one-piece ratcheting anti-rotation plate and an enhanced castle nut with radially machined grooves that register with the plate’s tooth and arm to resist loosening. The manufacturer describes the components as precision machined from 4140 steel and finished with QPQ nitride, and the design includes a Mil‑Spec QD sling attachment point below the buffer tube for sling compatibility.

Key Specifications

• The model is the RPS Ratchet Plate System.
• Designed to fit AR-15 platforms.
• Finished in QPQ Nitride for corrosion resistance and wear protection.
• The visible color is Black.
• Product type is listed as Castle Nut.
• Includes a Mil-Spec QD Sling Point integrated into the end plate.
• Features CNC machined single pass threads for consistent fitment.
• Uses a one-piece ratchet locking plate to retain the castle nut without staking.
• Specified dimension string from source data is 0.90 X 4.25 X 7.00.
• Source lists weight as .125.

Compact and function-focused, the LANTAC RPS provides a practical upgrade for users who want a retained castle nut solution with an integrated QD sling attachment. Its ratcheting anti‑rotation plate and protected engagement surfaces reduce the need for staking while preserving serviceability with standard armorer tools. For those seeking a durable, thoughtfully designed end plate and castle nut assembly, the RPS offers a balanced combination of function and fitment for AR-15 platforms.