• Integrated QD mount
  • Compatible with both Mil-Spec & commercial buffer tubes
  • Eliminates the need for staking


  • Material: 4140 Steel
  • Finish: Black
  • Weight:
    • Ratchet Lock Castle Nut: 0.55 oz.
    • QD End Plate: 0.6 oz.


  • AR-15 and AR-10


  • 1x PWS Ratchet Lock Castle Nut
  • 1x PWS QD End Plate


Most of us are guilty of a false belief that for something to be important it needs to be big and flashy. We all fall under the spell of a hot new manufacturer or succumb to the wiles of the do-hickey of the month now and then. The fact is that evolution isn’t just something that happens in big leaps. Sometimes it’s a small change that gives you a new leg up on the game. Primary Weapons Systems understands that. When they say they believe in strength through evolution, they’re talking about the whole package, not just the big expensive components. Case in point: The PWS Ratchet Lock Castle Nut and End Plate Set. Yes, it’s just a castle nut and end plate. It’s a pretty simple combination, yet the Ratchet Lock Castle Nut raises the bar in buffer tube attachment.

Primary Weapons Ratcheting Castle Nut: No More Staking

The Primary Weapons Systems Ratchet Lock Castle Nut and End Plate Set allows the armorer to attach either commercial type or Mil-Spec Buffer Tubes to your weapon system without the pain-in-the-neck of staking. Yes, it’s secure, and guess what PWS created this option considering the possibility that you might want or need to change a buffer tube before your weapon deadline. You’re not married to the installation and it won’t require you to destroy anything to get it apart. You might even do it without any colorful language.

The end plate includes and integrated QD mounting point for your sling swivel so you can get hooked up and get on with it. Is it a huge thing? That depends on how bad you need it today. Is it an evolution? Definitely. Why do we need it? Because It's Time we stop suffering over the small stuff and evolve.

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Reviews (33)

  • Ratchet lock castle nut and end plate

    Posted by Ira on 20th Aug 2023

    Easy to install. Everything is snug and solid. Makes this part of my build much easier. Looks great and performs perfect. Will be buying more for my other builds.

  • Primary Weapons Castle nut

    Posted by Ken on 4th Jun 2023

    I have assembled several AR-15 rifles using the Primary Weapons Ratchet Lock Castle Nut and End Plate. In my opinion, they are the best on the market. I will purchase these items again.

  • PWS Ratchet Lock Castle Nut And End Plate Set

    Posted by Mike on 13th Nov 2021

    I bought one of these a few years ago for some up and coming builds. For one reason or another I never git used and just sat in my spare parts box until last night. I started a modern tacticool AR build and decided to use it instead of the regular BCM QD mount, plate and castle nut. It went on extremely easy and both works as advertised as well as looks great too. I would recommend one to anyone that wants it right and tight now without any special knowledge of staking or the extra work. I'm very pleased with the purchase and would use one again on this type of build.

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