The 5/8"x24 Barrel Shim Kit for .308/7.62mm/.300BLK (32 Pack, 4 Units of 8 Thicknesses: .002" to .040") is a versatile and essential tool for precision shooters and firearms enthusiasts. Designed to work with .308, 7.62mm, and .300 Blackout (BLK) calibers, this shim kit offers various thicknesses to ensure precise and customizable fitting of barrel components to the firearm’s receiver. Below is a detailed review of its features, pros, and cons.Pros:Variety of Thicknesses:The kit includes 4 units of 8 different thicknesses, ranging from .002" to .040". This wide range of options allows for precise adjustments in aligning the barrel, ensuring that the barrel-to-receiver fit is exact for a variety of setups. The flexibility in thickness provides shooters with the ability to achieve a custom fit for their specific firearm, which is essential for accuracy and reliability.Having this range of thicknesses in a single kit helps save time and effort when making adjustments to a firearm, as shooters don’t need to purchase additional shims or guess which thickness will work best.Compatibility with Multiple Calibers:This kit is designed to be compatible with a variety of popular rifle calibers such as .308, 7.62mm, and .300BLK. These are some of the most commonly used cartridges for AR-style rifles, precision rifles, and hunting rifles.The 5/8"x24 threading is standard for many rifles, especially those with a mil-spec thread pattern, making this shim kit highly compatible with most rifles in those calibers.Precision Fit for Better Accuracy:Proper alignment of the barrel to the receiver is critical for accuracy. The shims in this kit ensure that the barrel is correctly indexed to the receiver, preventing any misalignment that could negatively impact the rifle’s performance.By using the right shim thickness, shooters can fine-tune the headspace and achieve better precision and consistency in their shots, making this kit an essential tool for anyone looking to optimize their rifle setup.High-Quality Materials:The shims in this kit are made from durable materials designed to withstand the stress and pressure that comes with high-performance shooting. This ensures that the shims won’t deform, wear out, or degrade over time, providing long-lasting functionality.The precision machining of the shims ensures a smooth fit, minimizing the risk of damaging the rifle’s components while maintaining the correct barrel alignment.Convenient and Organized Packaging:The kit comes with a 32-piece assortment, with each shim individually sized and labeled for easy identification. This makes the selection of the correct shim thickness quick and hassle-free. The included storage case ensures that all parts are kept neatly organized and easily accessible, reducing the chance of losing any parts.The organization and easy access to the correct size shims contribute to faster and more efficient installation and adjustment.Ideal for Custom Builds and Repairs:Whether you are building a custom rifle or making repairs to an existing firearm, this shim kit is an excellent tool for getting the perfect fit between the barrel and receiver. It is ideal for tuning rifles to match precision standards for competitive shooting or long-range accuracy.Cons:Limited to Specific Calibers and Thread Sizes:While the kit is compatible with .308, 7.62mm, and .300BLK calibers, it’s important to note that this shim kit is designed specifically for these calibers and for the 5/8"x24 thread pattern. If you are working with other calibers or thread sizes, this kit may not be suitable.Shooters with different firearm types or custom builds may need to look for other shim kits if their rifles use a different thread size or require shims for other calibers.Not a Complete Solution for All Barrel Issues:While these shims are great for correcting minor misalignments and ensuring proper headspace, they may not be a solution for more serious barrel issues such as worn-out threads or misaligned receivers. If the problem lies beyond simple alignment or shim thickness adjustments, a more thorough inspection or repair may be needed.The shim kit is primarily for minor adjustments, and does not address larger issues that could affect the performance of the barrel or receiver.Shims May Need to Be Replaced After Frequent Use:In high-usage firearms, especially those used for competitive shooting or high-round-count sessions, these shims may wear out or become deformed over time. Regularly checking the shims for wear and replacing them as necessary is important to maintain the tight fit and accuracy of the firearm.While the materials are durable, any shim used frequently in high-stress situations may need to be replaced after prolonged use.Some Assembly Skill Required:Installing shims requires a certain level of assembly skill and knowledge of how to properly adjust a barrel to the receiver. Shooters unfamiliar with firearm assembly or those lacking experience with shims may find the process a bit tricky, especially when determining the correct thickness for a given setup.A clear understanding of how shims work is necessary to avoid over-tightening, misalignment, or damaging the firearm components.Conclusion:The 5/8"x24 Barrel Shim Kit for .308/7.62mm/.300BLK calibers is an excellent and highly versatile tool for precision shooters, firearm enthusiasts, and gunsmiths. With 32 pieces in 8 different thicknesses, this kit provides everything needed to ensure a custom fit between the barrel and receiver, which is critical for maintaining accuracy, consistency, and overall firearm performance.The kit’s high-quality materials and well-organized packaging make it easy to use and store, offering great value for those who frequently work with these specific calibers. It’s an essential tool for anyone building, repairing, or customizing rifles to achieve optimal performance.While it is ideal for minor adjustments, serious issues with barrel alignment or thread wear may require additional attention. Additionally, those using rifles with different calibers or thread sizes may need to look for alternative kits.Overall, this shim kit is a fantastic choice for anyone who needs a precise and reliable solution for tuning their firearm and ensuring proper barrel alignment, particularly in the .308, 7.62mm, and .300BLK calibers.

Bought this for shimming the gas block on an M1A build. The shims are cleanly cut and accurate on thickness. Packed in a really cool box. Great price for a great product.

Exactly what I needed to time my muzzle devices. Plenty of sizes and a few of each size. I timed 4 different devices and still have plenty of shims left. Good value.

i'm working on an old break barrel air rifle that is having some accuracy issues and i was looking for some precision shims that would help reduce the play between reloads. when i saw this shim set, it looked perfect, and when i got it i was really impressed. it came in this beautiful red wood storage box that alone would be worth it and included a whole assortment of shims. i did have to get a different size too, and they were both consistently high quality with accurate dimensions and perfect finish. each thickness is in a separate bag that is labeled, saving you time and keeping them all well organized. the box is just an added bonus, but i definitely appreciate it. both sets were consistent quality and perfect for what i needed. i would highly recommend this precision shim set