B5 Systems AK Stock 5.5MM Black Review

First Thoughts on the B5 Systems AK Stock 5.5MM Black

The B5 Systems AK Stock 5.5MM Black is a drop-in replacement stock designed to modernize and enhance the ergonomics of AK-pattern rifles utilizing a 5.5mm folding trunnion. B5 Systems is known for producing high-quality, durable AR platform components, and I was eager to see if their expertise translated to the AK world. The promise of improved length-of-pull adjustment, enhanced sling mounting options, and a more comfortable cheek weld immediately caught my attention.

For years, I’ve been running a standard polymer AK stock on my Arsenal SLR-107CR, and while functional, it always felt a bit basic. The length of pull was too short for comfortable shooting with body armor, and sling mounting options were limited. I’d been eyeing aftermarket options, specifically collapsible stocks, for some time to enhance weapon manipulation and comfort.

The B5 Systems AK Stock 5.5MM Black arrived well-packaged and immediately impressed me with its solid feel. The composite material feels incredibly robust, and the steel hardware provides confidence in its durability. Compared to the Magpul Zhukov-S stock (which requires modification to the receiver), or the more expensive JMAC Customs offerings, the B5 Systems stock presented a balance of features and affordability. My initial excitement was high; this seemed like a well-thought-out, practical upgrade.

Real-World Testing: Putting B5 Systems AK Stock 5.5MM Black to the Test

First Use Experience

My first outing with the B5 Systems AK Stock 5.5MM Black was at my local outdoor range, where I typically run drills and practice weapon manipulations. I tested the stock on my Arsenal SLR-107CR, evaluating its performance with both light target loads and heavier defensive ammunition. The weather was dry and mild, providing ideal shooting conditions.

The improvement in ergonomics was immediately noticeable. Adjusting the length of pull was simple and secure, allowing me to find the perfect setting for a comfortable cheek weld. The non-slip buttpad provided a secure anchor, even during rapid firing. My initial impression was extremely positive.

Extended Use & Reliability

After several range sessions and even a weekend training course spanning months, the B5 Systems AK Stock 5.5MM Black has proven to be a reliable and worthwhile upgrade. It has endured exposure to rain, mud, and the general wear and tear associated with regular training. There are no signs of cracking or significant wear, even around the mounting points.

Cleaning is straightforward, requiring only a quick wipe-down with a damp cloth. The composite material resists staining and cleans easily. Compared to my previous stock, the B5 Systems offering is significantly more comfortable and versatile, providing a noticeable improvement in my shooting experience. It has outperformed all my expectations so far.

Breaking Down the Features of B5 Systems AK Stock 5.5MM Black

Specifications

The B5 Systems AK Stock 5.5MM Black is specifically designed as a drop-in replacement for AK rifles with a 5.5mm folding trunnion. It weighs in at a mere 12.5 oz, contributing minimally to the overall weight of the rifle. The stock measures 9 inches in length, 1.2 inches in width, and 4.33 inches in height. These dimensions provide a compact and streamlined profile without sacrificing functionality.

The stock features a collapsible length-of-pull adjustment, allowing for a customizable fit for various body types and gear configurations. It also includes an optic rail cutout, which prevents interference with side-mounted optics when the stock is folded. The cushioned nonslip buttpad enhances comfort and provides a secure shoulder weld. Fixed sling mounts and steel anti-rotational QD mounts offer versatile sling attachment options. The stock is constructed from durable composite material with steel hardware, ensuring long-lasting performance.

Performance & Functionality

The B5 Systems AK Stock 5.5MM Black performs its primary function – providing a stable and comfortable platform for shooting – exceptionally well. The length-of-pull adjustment allows for a customized fit, improving accuracy and recoil management. The stock is exceptionally durable and robust.

Its key strengths lie in its enhanced ergonomics and improved sling mounting options. A potential weakness is that some minor fitting may be required due to the variance in AK receiver tolerances, but this is a common issue with aftermarket AK parts. Overall, the stock meets and exceeds expectations for a drop-in replacement.

Design & Ergonomics

The B5 Systems AK Stock 5.5MM Black boasts a well-thought-out design that prioritizes both functionality and ergonomics. The composite material feels robust yet lightweight, contributing to a balanced feel. The stock is comfortable to shoulder and provides a solid cheek weld, enhancing accuracy.

The adjustment mechanism is intuitive and easy to use. There’s no steep learning curve, making it accessible for both experienced AK users and novices. It’s clearly designed with the user in mind.

Durability & Maintenance

The B5 Systems AK Stock 5.5MM Black is built to withstand the rigors of demanding use. The durable composite material and steel hardware ensure longevity and reliability. With proper care, this stock should provide years of dependable service.

Maintenance is simple, requiring only occasional cleaning with a damp cloth. The stock is resistant to most common solvents and lubricants. The simple design ensures that there are few parts that could break or require replacement.

Accessories and Customization Options

The B5 Systems AK Stock 5.5MM Black doesn’t require many accessories, as its main purpose is replacing the factory stock. However, its integrated QD sling mounts allow for the use of various aftermarket slings. The optic rail cutout enhances compatibility with side-mounted optics.

The stock is designed to be compatible with the standard 5.5mm folding trunnion, ensuring a seamless installation. While there aren’t specific customization options directly related to the stock itself, its design enhances the overall usability of the AK platform, facilitating the use of other accessories.

Pros and Cons of B5 Systems AK Stock 5.5MM Black

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Who Should Buy B5 Systems AK Stock 5.5MM Black?

The B5 Systems AK Stock 5.5MM Black is perfect for AK owners looking to upgrade their factory stock with a more ergonomic and versatile option. It is ideal for tactical shooters, competitive shooters, and anyone seeking to improve the handling and comfort of their AK rifle. It is particularly beneficial for users who frequently wear body armor or need to adjust their length of pull for different shooting positions.

Individuals seeking highly modular systems with extensive customization options may want to explore other alternatives. This stock is a drop-in replacement designed to offer enhanced ergonomics and usability rather than radical modifications. A must-have accessory to go with it is a quality QD sling to take full advantage of the mounting options.

Conclusion on B5 Systems AK Stock 5.5MM Black

The B5 Systems AK Stock 5.5MM Black is a well-designed and durable upgrade that significantly enhances the ergonomics and usability of AK-pattern rifles. Its collapsible length of pull, improved sling mounting options, and comfortable cheek weld make it a worthwhile investment for any serious AK enthusiast. While some minor fitting may be required, the benefits far outweigh the potential hassle.

At $96.99, the price is justified by the quality of materials, thoughtful design, and tangible improvements in shooting performance. I would personally recommend the B5 Systems AK Stock 5.5MM Black to anyone looking to modernize their AK and enhance their shooting experience. Upgrade your AK today and experience the difference!

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