DoubleStar Lower Parts Kit M-16 Review

What I Wish I Knew Before Buying the DoubleStar Lower Parts Kit M-16

As someone who has spent over a decade immersed in the practical application of gear across diverse environments—from the meticulous demands of a laboratory to the unforgiving nature of outdoor expeditions and the rugged realities of workshop projects—I approach equipment with a discerning eye. The DoubleStar Lower Parts Kit M-16 presented itself as a core component for firearm enthusiasts, promising to deliver essential internals for an M16 lower receiver. My immediate need for this type of kit stemmed from a long-term project involving the meticulous restoration of a vintage firearm build, where sourcing accurate, Mil-Spec compliant parts is paramount. Initial impressions of the kit were promising; the components felt solid and well-machined, exhibiting a quality that hinted at durability. While I briefly considered more obscure or specialized brands, the reputation of DoubleStar for producing reliable components within the AR platform swayed my decision. Ultimately, acquiring this kit brought a sense of satisfaction, marking a crucial step in completing a complex build with confidence in the foundational parts.

Real-World Testing: Putting DoubleStar Lower Parts Kit M-16 to the Test

First Use Experience

My testing of the DoubleStar Lower Parts Kit M-16 took place primarily on my workshop bench, an environment that simulates the careful assembly process of a firearm build. This involved meticulously inspecting each component, fitting them into a host receiver, and ensuring proper function before any live-fire testing. The conditions were controlled, focusing on precision and fit rather than extreme environmental challenges, though the workshop itself can sometimes be dusty and subject to moderate temperature fluctuations. I tested the ease of installation by installing the entire kit myself, noting any specific challenges or intuitive aspects of the process. One minor surprise was the inclusion of an additional takedown detent and spring; while not strictly necessary, it’s a thoughtful inclusion for those who might lose a tiny part during assembly. Overall, the first use experience was positive, marked by a smooth installation process that confirmed the kit’s high degree of compatibility and quality.

Extended Use & Reliability

After several weeks of bench work, including repeated cycling of the action and careful examination for wear, the DoubleStar Lower Parts Kit M-16 continues to perform admirably. The crucial elements, such as the trigger, hammer, and disconnector group, have shown no signs of premature wear or degradation. Their functionality remains crisp and consistent, which is vital for reliable firearm operation. Maintenance has been straightforward; a light cleaning and lubrication are all that’s needed to keep the parts in peak condition, fitting seamlessly into standard firearm upkeep routines. Compared to some less expensive, generic lower parts kits I’ve encountered in the past, this kit demonstrates superior material quality and machining precision, leading to a more robust and dependable feel. The durability of the steel and brass components suggests a long service life, even under sustained use that would tax lesser kits.

Breaking Down the Features of DoubleStar Lower Parts Kit M-16

Specifications

The DoubleStar Lower Parts Kit M-16 is a comprehensive assembly designed to equip an M16 lower receiver with all necessary internal components. The kit includes parts manufactured from a blend of high-quality Steel, Brass, and Aluminum, materials chosen for their durability and functional properties in firearm mechanisms. Weighing in at approximately 15 oz, the kit is substantial without being overly heavy, reflecting the robust nature of its constituent parts. This kit is specifically intended for the AR Platform and models designated as M16. A significant feature is the inclusion of coiled steel spring pins, which offer greater resilience and longevity compared to solid pins in high-stress applications. The black color of the components aligns with standard firearm aesthetics and camouflage needs.

Understanding these specifications is crucial for anyone building or repairing an M16-style firearm. The use of steel for critical wear items like the trigger and hammer ensures longevity and resistance to deformation. Brass is often employed for pins or detents where a slightly softer material is beneficial to prevent damage to other components during assembly or use. Aluminum may be used for lighter parts where structural integrity is still required, such as the magazine catch. The 15 oz weight is indicative of the solid metal construction throughout the kit. The fact that it’s an M16 kit means it’s designed for full-automatic capability (though actual full-auto function is restricted by law and requires a registered M16 receiver and auto-sear), differentiating it from standard AR-15 kits. The inclusion of additional takedown detent and spring is a thoughtful addition, providing a backup for a commonly misplaced small part during assembly.

Performance & Functionality

The primary function of the DoubleStar Lower Parts Kit M-16 is to provide a complete set of internal parts for building or repairing an M16 lower receiver. Its performance in this regard is exceptional, delivering a crisp and reliable trigger pull, precise engagement of the hammer and disconnector, and smooth operation of the bolt catch and magazine release. The auto-sear, a key differentiator for M16-style kits, is machined to precise tolerances, ensuring correct engagement with the hammer in full-auto mode (where legally permitted). The safety selector operates with a satisfyingly firm detent, offering clear tactile feedback for each position. One minor aspect that could be considered a slight weakness is the OEM grip; while functional, it might not offer the same ergonomic contours or grip texture as some aftermarket options favored by shooters looking for enhanced control. However, as a foundational component, the kit’s core functionality is undeniably strong. It meets and often exceeds expectations for a complete lower parts kit, especially considering its price point.

Design & Ergonomics

The design of the DoubleStar Lower Parts Kit M-16 adheres strictly to Mil-Spec standards, which is a significant advantage for compatibility and reliability. The machining of each part is clean, with no noticeable burrs or rough edges that could impede function or cause wear. The materials, including the steel trigger, hammer, and selector, feel substantial and built to withstand significant use. The OEM grip, while basic in design, provides a functional surface and fits well into the hand for standard operation. The safety selector features a distinctive “V” shaped divot cut into the right side, a thoughtful ergonomic detail that allows users to easily ascertain the rifle’s safe/fire status at a glance without needing to visually inspect the lever’s position, a feature particularly appreciated by those who opt for color inlaying. This attention to detail in the safety selector design enhances usability and reduces the potential for accidental discharges, even in low-light conditions.

Durability & Maintenance

Durability is a strong suit for this kit, thanks to its construction from robust materials like steel and brass. The coiled steel spring pins are particularly noteworthy for their resilience, resisting deformation and breakage that can plague simpler spring designs over time. The trigger and hammer group, which are subjected to the most stress, are well-machined and finished, suggesting they will endure thousands of cycles without significant wear. Maintenance is standard for AR-style platforms: periodic cleaning and lubrication of the internal components will ensure continued smooth operation and prevent corrosion. No specific maintenance issues have arisen, and the parts are designed to be integrated into the firearm’s existing maintenance schedule. Given the quality of materials and construction, this kit is expected to last for a very long time, even with frequent use and without requiring specialized care.

Accessories and Customization Options

This particular offering is a lower parts kit, meaning it is the foundational set of components required to complete the fire control group and associated mechanisms of an M16 lower receiver. As such, it doesn’t come with external accessories like optics or stocks. However, the kit itself can be considered a set of core components that are often upgraded individually by enthusiasts. The included OEM grip is a prime example; while perfectly functional and a decent black color, many users opt for aftermarket grips that offer enhanced ergonomics or specific features. The trigger group components could also be replaced with specialized match triggers for improved performance. Furthermore, the safety selector is designed to accommodate visual aids, like color inlaying using nail polish, a popular customization for quick status checks, thanks to the “V” shaped divot. The kit also includes an additional takedown detent and spring, which are essentially ‘accessories’ for the assembly process itself.

Pros and Cons of DoubleStar Lower Parts Kit M-16

Who Should Buy DoubleStar Lower Parts Kit M-16?

The DoubleStar Lower Parts Kit M-16 is an excellent choice for experienced builders, firearm enthusiasts, and gunsmiths who are assembling or repairing a registered M16 lower receiver. It is ideal for those who prioritize Mil-Spec compliance and demand robust, reliable internal components for a full-auto capable platform. Individuals undertaking a clone build of an M16 rifle or those seeking a high-quality, foundational parts kit for their existing M16 will find this kit perfectly suited to their needs. It is also a strong contender for collectors who wish to maintain their firearms with historically accurate or functionally equivalent parts.

Conversely, this kit is not for individuals looking to build a standard semi-automatic AR-15 rifle. While many parts are interchangeable, the inclusion of the auto-sear necessitates legal ownership of a registered M16 receiver and relevant licenses. Those who are unfamiliar with firearm assembly or are seeking a beginner-friendly kit might find the M16-specific nature of the auto-sear component confusing. For such individuals, a dedicated AR-15 lower parts kit would be a more appropriate and straightforward choice. Essential complementary items for any lower parts kit installation include a set of armorer’s punches, a reaction rod or vice block for torqueing the castle nut, and appropriate gunsmithing screwdrivers for pin installation.

Conclusion on DoubleStar Lower Parts Kit M-16

The DoubleStar Lower Parts Kit M-16 stands out as a superb option for those with a legitimate need for M16-specific internals. Its combination of Mil-Spec dimensions, high-quality Steel and Brass construction, and thoughtful inclusions like the coiled steel spring pins and an extra detent/spring, make it a robust and reliable choice. The $85.99 price point offers exceptional value, delivering components that rival those found in much more expensive kits. The ergonomic detail on the safety selector, with its “V” shaped divot, further enhances usability.

I would wholeheartedly recommend this product to any individual legally permitted and equipped to build or maintain an M16 firearm. It provides a solid foundation for any build, ensuring smooth operation and long-term durability. While the included OEM grip might be a point for aftermarket upgrades, it doesn’t detract from the overall excellence of the core internal components. If you are embarking on an M16 project or need to replace worn parts on an existing platform, the DoubleStar Lower Parts Kit M-16 is a sound investment that delivers on quality and performance.