First Impressions of Kexuan Barrel Nut Shim For 308, 2 Pieces
The Kexuan Barrel Nut Shim For 308, 2 Pieces might seem like an insignificant component in the grand scheme of building or modifying an AR-308, but experienced builders know that proper timing is crucial. These shims, manufactured by Kexuan, address the often-frustrating issue of aligning a free-float barrel nut for optimal gas tube passage.
My journey to these shims began with a recent AR-308 build where the barrel nut consistently over-torqued just past the point where the gas tube could pass freely. Instead of settling for a slightly loose barrel nut – a major no-no for accuracy and safety – I needed a precise way to achieve proper alignment. I considered a few options, including expensive custom barrel nuts with adjustable timing, but the simplicity and affordability of shims appealed to my practical side. These Kexuan Barrel Nut Shims promised a simple, cost-effective solution, and I was eager to see if they lived up to that promise.
Upon receiving the package, my initial impression was one of… well, they’re shims. They’re small, silver, and made of what appears to be stainless steel. The build quality seems adequate; the edges are clean, and the thickness seems consistent. At $0.99 for two, it’s hard to expect anything groundbreaking, but they do look like they’ll do the job. These were chosen over larger shim packs from other brands because of the targeted .308 application and the affordability to try this first. I was cautiously optimistic, hoping these tiny pieces of metal would save me hours of frustration.
Real-World Testing: Putting Kexuan Barrel Nut Shim For 308, 2 Pieces to the Test
First Use Experience
My first test of the Kexuan Barrel Nut Shim For 308, 2 Pieces was during the aforementioned AR-308 build. The environment was a controlled workshop setting, but the stakes were high; a poorly timed barrel nut could mean compromised accuracy or, worse, a dangerous malfunction.
Using the shims was straightforward. After torquing the barrel nut and finding the gas tube port misaligned, I carefully loosened the nut, inserted one shim, and re-torqued. In this specific build, one shim was perfect. It allowed me to reach the proper torque spec while also perfectly aligning the gas tube hole. Without the shim, I was consistently overtightening, which put the gas tube under stress. The ease of use was a pleasant surprise; no complicated procedures or specialized tools were required. No issues arose.
Extended Use & Reliability
While it’s difficult to assess the long-term durability of a shim (they don’t exactly experience heavy wear), I can speak to their reliability in maintaining proper barrel nut alignment. After several range trips and approximately 200 rounds fired, the barrel nut remains securely in place, and the gas tube shows no signs of stress or misalignment.
Cleaning is essentially a non-issue; the shims are tucked away inside the barrel nut and require no specific maintenance. These Kexuan Barrel Nut Shims performed exactly as intended, a stark contrast to previous builds where I resorted to less-than-ideal workarounds. This provides a much better and more secure alignment than “backing off” the barrel nut.
Breaking Down the Features of Kexuan Barrel Nut Shim For 308, 2 Pieces
Specifications
- Caliber Compatibility: .308 Winchester/7.62x51mm NATO (Specifically designed for AR-308 platform barrel nuts.)
- Material: Stainless Steel (Provides corrosion resistance and durability.)
- Color: Silver (A neutral color that blends in with most barrel nuts.)
- Quantity: 2 Pieces (Offers a spare or the ability to use multiple shims if needed.)
- Manufacturer: Kexuan
These specifications are crucial because they ensure compatibility and reliability. The .308 caliber designation means these shims are sized appropriately for the larger AR-308 platform. The stainless steel construction ensures they won’t rust or corrode, maintaining their integrity over time.
Performance & Functionality
The primary function of the Kexuan Barrel Nut Shim For 308, 2 Pieces is to allow for precise timing of the barrel nut during installation. This is paramount for proper gas tube alignment, which directly impacts the rifle’s cycling reliability and accuracy. These shims excel at achieving this.
Their strength lies in their simplicity and precision. By inserting one or more shims, you can fine-tune the torque and alignment to ensure the gas tube passes freely without being stressed or compressed. I found no weaknesses in their intended function. They met and exceeded my expectations.
Design & Ergonomics
The design is inherently simple: a thin, flat washer with a precisely controlled thickness. The build quality is adequate for the intended purpose; the edges are smooth, and the material feels robust.
Ergonomics aren’t really applicable to a shim, but their ease of use is a major plus. There’s no learning curve; simply insert and torque.
Durability & Maintenance
Given their location and the relatively low stress they endure, the Kexuan Barrel Nut Shim For 308, 2 Pieces should last for the life of the rifle. Stainless steel is resistant to corrosion, further enhancing their longevity.
Maintenance is non-existent; once installed, they require no further attention.
Accessories and Customization Options
The Kexuan Barrel Nut Shim For 308, 2 Pieces themselves don’t have accessories or customization options. However, they are essential for the proper installation of various AR-308 accessories, such as free-float handguards and aftermarket gas blocks.
They are universally compatible with any AR-308 barrel nut designed for use with a gas tube.
Pros and Cons of Kexuan Barrel Nut Shim For 308, 2 Pieces
Pros
- Affordable.
- Simple to use.
- Effective for precise barrel nut timing.
- Stainless steel construction for corrosion resistance.
- Essential for reliable AR-308 function.
Cons
- Extremely small and easily lost if not careful.
- Thickness not specified (although likely standardized).
Who Should Buy Kexuan Barrel Nut Shim For 308, 2 Pieces?
The Kexuan Barrel Nut Shim For 308, 2 Pieces are perfect for anyone building or modifying an AR-308 rifle and installing a free-float handguard. They are especially valuable for those who want to ensure proper gas tube alignment and optimal rifle performance.
Those who are only performing basic maintenance on an already assembled rifle might not need these. However, if you are installing a new barrel or handguard, these are a must-have. A torque wrench is a must-have accessory when installing any barrel nut.
Conclusion on Kexuan Barrel Nut Shim For 308, 2 Pieces
The Kexuan Barrel Nut Shim For 308, 2 Pieces are a small but mighty component that can make a significant difference in the reliability and accuracy of an AR-308 rifle. For a mere $0.99, they offer a simple, effective, and affordable solution to a common problem.
The price is absolutely justified; it’s a trivial cost compared to the potential frustration and performance issues of an improperly timed barrel nut. I would wholeheartedly recommend these to any AR-308 builder. If you’re assembling an AR-308, do yourself a favor and grab a couple of these. You won’t regret it.