Premium Ratchet Lock Castle Nut and Endplate Set for AR-15/M4 Platforms
Elevate your rifle’s reliability and ease of maintenance with the Primary Weapons Systems Ratchet Lock Castle Nut and Endplate Set. Designed for AR-15 and M4 platforms, this innovative set replaces traditional staked castle nuts with a superior ratcheting mechanism that ensures consistent torque and eliminates the need for specialized tools. Whether you’re building a new rifle or upgrading an existing one, this set provides a professional-grade solution that enhances both function and durability.
Key Features and Benefits
- Tool-Free Installation: The ratchet lock design allows for quick and easy installation without requiring armorers wrenches or staking tools, saving time and effort during assembly or maintenance.
- Secure Locking Mechanism: Once torqued to specification, the castle nut locks securely in place, preventing loosening under recoil and ensuring long-term stability for your buffer tube.
- Enhanced Durability: Made from high-quality materials, this set resists wear and corrosion, making it ideal for harsh environments and heavy use.
- Compatibility: Designed to fit standard AR-15/M4 buffer tubes, offering a seamless upgrade for most rifles without modification.
- Improved Aesthetics: The sleek, machined finish adds a professional look to your firearm, complementing other upgrades from Texas Gun Store.
Why Choose This Ratchet Lock Castle Nut Set?
Based on extensive experience in firearms customization, this product addresses common issues with traditional castle nuts, such as improper staking or loosening over time. Its authoritativeness is backed by Primary Weapons Systems’ reputation for precision engineering, while its trustworthiness comes from proven performance in field use. By investing in this set, you gain peace of mind knowing your rifle’s critical components are secure and reliable.
Specifications and Details
This set includes a ratchet lock castle nut and a matching endplate, both engineered to exacting standards. The castle nut features a serrated design that engages with the endplate’s locking teeth, creating a firm hold without marring surfaces. It’s ideal for builders, competitive shooters, and enthusiasts seeking a hassle-free upgrade.
Why Buy from Texas Gun Store?
- Expertise: Our team has years of experience in firearms and accessories, ensuring you get knowledgeable advice and quality products.
- Trust: We source directly from reputable manufacturers like Primary Weapons Systems, guaranteeing authenticity and reliability.
- Customer Support: Dedicated service for orders, returns, and technical questions to enhance your shopping experience.
- Fast Shipping: Quick processing and delivery so you can upgrade your rifle without delay.
Images



| Material | Steel (typically 4140 or similar alloy) |
| Finish | Black oxide or phosphate coating |
| Compatibility | AR-15, M4, and compatible platforms |
| Thread Size | Standard 1-3/16″ x 18 TPI (for buffer tubes) |
| Installation | Tool-free ratchet mechanism |
| Torque Specification | Approximately 35-40 ft-lbs (follow manufacturer guidelines) |
| Weight | Approximately 2-3 ounces (for the set) |
| Brand | Primary Weapons Systems (PWS) |





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