The Collapsible Precision Stock (CPS) from B5 Systems combines the compact adjustability of a traditional M4 stock with the fine-tuning features normally found on precision rifle stocks. Designed to fit standard AR-15 buffer tubes, it offers adjustable cheek height, length of pull, and strong construction, making it suitable for a wide range of rifles and shooting style.
One of the biggest advantages of the AR-15 is its modular design. A single lower receiver can support many configurations—from compact carbines to long-range precision rifles.
Because of this flexibility, shooters often customize components such as triggers, optics, handguards, and stocks. Among these parts, the stock plays a critical role in ergonomics. It affects:
For many rifles, the standard collapsible M4 stock is the default option. While lightweight and adjustable, it lacks the precision adjustments required for rifles equipped with larger optics or intended for long-range shooting.
B5 Systems built its reputation producing improved versions of the well-known SOPMOD stock, originally developed for U.S. military use.
The original design was created to meet requirements from the Naval Surface Warfare Center Crane Division as part of the Special Operations Peculiar Modification (SOPMOD) program. The goal was to improve the standard M4 stock by providing better cheek weld and durability.
After early production runs by Lewis Machine & Tool, B5 Systems eventually secured a government contract to produce their own version of the SOPMOD design. Their stocks quickly gained popularity due to their durability and lower cost.
To address the needs of precision rifle shooters, B5 Systems developed the Collapsible Precision Stock (CPS).
Unlike many precision stocks that require a long rifle-length receiver extension, the CPS mounts on a standard M4 buffer tube, allowing it to remain compact while still providing precision adjustments.
Key features include:
Despite these features, the CPS weighs only about 21 ounces, making it lighter than many traditional precision rifle stocks.
The CPS includes two major adjustment controls designed to fine-tune the shooter’s fit.
Length of Pull Adjustment
A vertical dial at the rear of the stock controls the extension of the buttpad. Turning it counter-clockwise increases the distance between the trigger and the shoulder, allowing the rifle to better fit shooters of different sizes.
Comb Height Adjustment
A horizontal dial raises or lowers the cheek rest. This helps shooters align their eye with optics that sit higher above the rail, such as larger scope systems.
These adjustments allow shooters to achieve a consistent cheek weld and comfortable shooting position both essential for accurate shooting.
The CPS is designed for simple installation and removal. A locking tab secures the stock to the buffer tube and can be released easily without tools.
Construction consists of high-density polymer reinforced with aluminum, giving the stock a solid feel and strong durability. When mounted to a mil-spec buffer tube, the stock exhibits minimal movement or play.
This tight fit contributes to improved stability and overall shooting performance.
Although designed primarily for AR-pattern rifles, the CPS can be installed on many firearms that accept M4-style receiver extensions.
For example, shooters have successfully mounted the stock on rifles such as:
In some cases, the additional weight of the CPS actually improves the firearm’s balance. On rifles that tend to feel front-heavy especially when suppressors or long handguards are installed the heavier stock helps shift the center of gravity closer to the shooter.
The Collapsible Precision Stock from B5 Systems successfully bridges the gap between lightweight collapsible stocks and full-size precision rifle stocks.
By combining:
the CPS provides shooters with a versatile option suitable for everything from precision AR builds to multi-platform rifle setups.
For those seeking improved ergonomics without the bulk of traditional precision stocks, the CPS stands out as a strong contender in the modern rifle accessory market.
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