Knights Armament 116858 SR-25 Lower Receiver Assembly Kit: The Foundation for Uncompromising Precision

For serious firearm enthusiasts, professional users, and precision rifle builders, the choice of components is paramount. When it comes to large-frame AR platforms, specifically the legendary SR-25, selecting the right foundation is non-negotiable. The Knights Armament (KAC) 116858 Lower Receiver Assembly Kit, meticulously engineered for the SR-25, provides that exact bedrock of quality, reliability, and performance. This semi-complete lower receiver kit is designed to streamline the building process while ensuring the final rifle adheres to the exacting standards synonymous with the Knights Armament name.

Are you embarking on a new SR-25 build? Or perhaps you’re looking to upgrade an existing rifle with a robust, duty-ready lower? This KAC assembly kit is the answer. It’s optimized for those who demand top-tier components that perform flawlessly under diverse conditions, from competitive long-range shooting to demanding tactical operations. This kit is specifically tailored for the AR-10 style gun platform, ensuring perfect compatibility with SR-25 upper receivers and associated components.

Why Choose a Knights Armament SR-25 Lower Receiver? The KAC Advantage

Knights Armament Company has a storied history of developing innovative and battle-proven firearms and accessories for military, law enforcement, and civilian markets worldwide. Their SR-25 platform, a direct descendant of the AR-10, stands as a benchmark for semi-automatic precision rifle systems. When you invest in a KAC lower receiver assembly, you’re not just buying a part; you’re acquiring a component forged from decades of engineering excellence, rigorous testing, and real-world application.

• Unrivaled Quality Control: Every KAC component undergoes stringent quality assurance processes, ensuring each unit meets precise specifications and dimensional tolerances. This meticulous attention to detail translates directly into superior fit, finish, and operational reliability.
• Battle-Proven Design: KAC products are not just theoretical designs; they are extensively field-tested and adopted by elite military units globally. The SR-25, in particular, has seen extensive service as a Designated Marksman Rifle (DMR) and precision semi-automatic sniper system, proving its capability in the most demanding environments.
• Seamless Integration: Designed specifically for the SR-25 platform, this lower receiver assembly kit ensures perfect fitment and function with other Knights Armament SR-25 components, minimizing compatibility issues often encountered with mixed-brand builds.
• Enhanced Ergonomics and Control: The included black pistol grip and ambidextrous controls are not aftermarket additions but integral parts of KAC's holistic design philosophy, focusing on user comfort and operational efficiency.

Comprehensive Breakdown of the 116858 Lower Receiver Assembly Kit

This semi-complete kit is much more than just a stripped lower receiver. It thoughtfully bundles essential components, pre-installed or included, to accelerate your build and ensure proper functionality from the outset.

The Lower Receiver: The Heart of Your SR-25

The core of this kit is the precisely machined lower receiver, finished in a durable black coating. Crafted from high-grade aluminum, it provides the robust foundation necessary for a large-caliber precision rifle. Its design incorporates all the critical interfaces for the upper receiver, buffer system, trigger group, and magazine.

• Material Excellence: Typically manufactured from aerospace-grade 7075-T6 aluminum, known for its exceptional strength-to-weight ratio and resistance to wear and corrosion.
• Precision Machining: KAC’s state-of-the-art machining ensures all pinholes, threading, and internal dimensions are held to incredibly tight tolerances, which is critical for smooth operation and long-term durability.
• Durable Finish: The black hard-coat anodized finish provides superior resistance to scratches, abrasions, and environmental factors, preserving the receiver's aesthetic and protective qualities even under harsh use.

Integrated Ambidextrous Controls for Superior Handling

A hallmark of modern tactical firearms, ambidextrous controls are crucial for adaptability and rapid manipulation, whether you’re shooting strong-hand or support-hand. The 116858 kit thoughtfully includes:

• KAC Ambidextrous Magazine Release: This critical component allows for quick and intuitive magazine changes from either side of the firearm, enhancing speed and efficiency, especially in dynamic shooting scenarios. It’s an invaluable feature for competitive shooters and professional operators alike.
• KAC Ambidextrous Bolt Release: Providing universal access to the bolt catch mechanism, this feature ensures that locking the bolt back or sending it forward after a magazine change can be done seamlessly from either side, minimizing down-time and improving shooter readiness.
• KAC Trigger Guard (Installed): Unlike some stripped lowers that require a separate trigger guard, this kit comes with a KAC-specific trigger guard already installed. This ensures a perfect fit and eliminates a potential point of frustration during assembly. Its design often allows for gloved use without sacrificing trigger finger access.

The Black Buffer Tube (Receiver Extension)

The buffer tube, or receiver extension, is a vital component that houses the buffer and buffer spring, which are integral to the rifle's recoil system and cyclic operation.

• Mil-Spec Dimensions: KAC buffer tubes are typically manufactured to mil-spec (military specification) dimensions. This ensures compatibility with a wide range of standard AR-style buttstocks and provides a robust, reliable platform for the recoil system.
• Durability: Made from high-strength aluminum, the buffer tube is designed to withstand the significant forces generated during the firing cycle of an SR-25, contributing to the overall longevity and reliability of the rifle.
• Black Finish: Matching the receiver, the black finish on the buffer tube maintains a consistent aesthetic for your build.
• Included End Plate and Castle Nut: The kit includes the necessary end plate and castle nut, allowing for the secure installation of your chosen stock and proper staking to prevent loosening under recoil.

The KAC A2 Pistol Grip: Ergonomics Meets Control

The pistol grip is a critical interface between the shooter and the firearm, directly impacting comfort, control, and trigger discipline. The Knights Armament 116858 kit includes a black A2-style pistol grip.

• Classic A2 Design: The A2 grip is a widely recognized and proven design, offering a comfortable and secure hold for most hand sizes. Its finger groove and ergonomic shape provide a stable platform for consistent shot placement.
• Durable Polymer Construction: Typically molded from a robust, impact-resistant polymer, the grip is designed to endure harsh environments and extensive use without degrading.
• Enhanced Control: A good pistol grip reduces shooter fatigue and improves overall weapon control, which is particularly important for the larger and heavier SR-25 platform.

Who Is This KAC SR-25 Lower Receiver Assembly Kit For?

This Knights Armament 116858 kit is an ideal choice for a specific echelon of firearm enthusiasts and professionals:

• Precision Rifle Builders: If you're building a custom SR-25 for long-range competition, hunting, or tactical applications, this kit provides a high-quality, pre-assembled foundation.
• Knights Armament Enthusiasts: For collectors and users dedicated to the KAC ecosystem, this lower receiver is essential for maintaining brand consistency and performance.
• Military and Law Enforcement Professionals: Those needing a reliable, duty-grade large-frame AR platform for designated marksman roles or specialized operations will find KAC’s components meet the most stringent demands.
• Upgrade Seekers: Existing SR-25 owners looking to replace a worn lower or upgrade to ambidextrous controls and KAC's specific internal components will benefit greatly.
• Individuals Prioritizing Reliability and Performance: If compromising on quality is not an option for your firearm, the KAC 116858 kit stands out as a superior choice.

Addressing Common Questions About SR-25 Builds and Lower Receivers

Building an AR-10 style rifle like the SR-25 can seem daunting, but starting with high-quality components simplifies the process and ensures a more reliable end product.

• "What parts do I need for a complete SR-25 build using this lower?" With the KAC 116858 semi-complete lower, you will primarily need an SR-25 compatible upper receiver assembly (barrel, handguard, bolt carrier group, charging handle), a stock, and a trigger group (trigger, hammer, disconnector, springs, pins). The kit has already provided the lower receiver, buffer tube, pistol grip, ambidextrous magazine release, ambidextrous bolt release, and trigger guard.
• "Is the Knights Armament 116858 compatible with standard AR-10 parts?" While the SR-25 shares lineage with the AR-10, it's crucial to understand that the SR-25 platform often uses proprietary parts for optimal function, especially for the upper receiver and its interface with the lower. While the buffer tube and pistol grip might be standard AR-compatible, the lower receiver itself is designed specifically for SR-25 upper compatibility, which can differ from DPMS-pattern or Armalite AR-10 designs. Always confirm compatibility when mixing components.
• "How does a semi-complete lower differ from a stripped lower?" A stripped lower receiver is just the receiver forging itself, requiring all small parts (magazine catch, bolt catch, pivot pins, trigger guard, etc.) to be installed. A semi-complete lower, like the KAC 116858, comes with many of these small parts already installed (like the ambidextrous controls and trigger guard), significantly reducing the complexity and time required for assembly.
• "What are the benefits of ambidextrous controls on a rifle?" Ambidextrous controls provide ergonomic flexibility, allowing both left-handed and right-handed shooters to operate the firearm efficiently. They are particularly beneficial in tactical or competitive settings where quick manipulation and adaptability are critical, enabling seamless transitions and strong-hand/support-hand shooting without awkward movements.
• "Why is Knights Armament considered a premium brand?" KAC's reputation stems from their relentless pursuit of innovation, stringent manufacturing processes, and extensive use by elite military forces globally. Their products are designed to excel in extreme conditions, offering unmatched reliability, durability, and precision. This commitment to performance and the highest standards of quality places them at the pinnacle of firearm component manufacturing.

Maximizing Your SR-25 Build with KAC Components

Starting your SR-25 project with the Knights Armament 116858 Lower Receiver Assembly Kit sets you on the path to building a high-performance, precision rifle. Its inclusion of essential pre-installed ambidextrous controls and an A2 pistol grip, alongside a robust buffer tube, saves time and ensures component harmony. This comprehensive approach minimizes the variables in a custom build, allowing you to focus on the upper receiver and trigger group to complete your bespoke SR-25.

Whether you are assembling a precision Designated Marksman Rifle (DMR), a long-range hunting rifle, or a robust tactical platform, the underlying quality of the lower receiver profoundly impacts the rifle's overall performance and longevity. The KAC 116858 stands as a testament to engineering excellence, offering a rock-solid foundation that will withstand the rigors of extensive use and deliver consistent, reliable operation. This investment in quality will pay dividends in accuracy, durability, and peace of mind, knowing your firearm is built on a foundation of uncompromising standards.

For this Knights Armament SR-25 Lower Receiver Assembly Kit and other high-quality firearm components, enthusiasts and professionals can confidently turn to DEGuns.com. As a reputable source for leading firearm brands, DEGuns offers a wide selection of KAC products, ensuring you have access to the components you need for your next build or upgrade, all backed by knowledgeable support.

Product Specifications Overview

Feature	Detail
Brand	Knights Armament
Model	Lower Receiver Assembly
Type	Semi-Complete Kit
Firearm Fit	SR-25
Gun Platform	AR-10 Style
Grip Type	Pistol Grip (Black)
Buffer Tube	Black
Receiver	Black Finish
MPN	116858
SKU	130071
UPC	819064017776