The Lantac RPS Ratchet Plate System (brand part number 01-UP-RPS) replaces a standard AR-15 castle nut with a single-piece ratchet locking plate that stays put under recoil instead of backing off over time. Lantac precision machines the plate from 4140 steel with CNC single-pass threads and finishes it in QPQ nitride for corrosion and wear resistance, then shapes the grip pattern with an aggressive, tactile texture for a solid hand hold during installation. A built-in Mil-Spec QD sling point adds a quick-detach attachment point right at the buffer tube without a separate accessory, and the protected engagement surfaces keep the locking mechanism from getting damaged during install or in the field. It’s made in the USA and built as a straightforward, stronger replacement for the factory castle nut.

Key Specifications

• Includes a Mil-Spec QD sling point built directly into the plate.
• Uses CNC single-pass threads for precise, consistent engagement.
• Features a one-piece ratchet locking design that resists loosening under recoil.
• Protects engagement surfaces from accidental damage during installation.
• Shaped with an aggressive grip pattern for a secure hand hold.
• Machined from 4140 steel with a QPQ nitride finish for durability.
• Made in the USA.
• Eliminates the need to stake the castle nut in place after installation.

Frequently Asked Questions

Does this add a sling attachment point? Yes, it includes a built-in Mil-Spec QD sling point.

What’s it made from? 4140 steel with a QPQ nitride finish, made in the USA.

Buy the Lantac RPS Ratchet Plate System – Black

Lock down your buffer tube with a ratchet plate built to stay tight under recoil. Order it from our Lantac USA lineup, part of our gun accessories selection, at our Lubbock, Texas gun shop for direct shipping.