Let’s Dive into CMMG, Inc MK3 Action Spring
The CMMG, Inc MK3 Action Spring is a seemingly small, yet incredibly vital component in the AR-10 platform, specifically designed for CMMG’s MK3 rifles. It’s easy to overlook the importance of an action spring, but seasoned shooters know it’s the heart of reliable cycling. I was drawn to this product because I’ve been battling inconsistent cycling in my MK3, resulting in frustrating malfunctions during competitions.
My first impression upon receiving the spring was underwhelming, visually. It’s just a spring. However, after handling it, I noticed the spring rate felt consistent and smooth, suggesting high-quality construction, despite its simple appearance.
Compared to generic AR-10 springs, the CMMG spring appears to have a tighter winding and a slightly heavier gauge wire, indicating a potentially longer lifespan and more consistent cycling. I also considered a JP Enterprises polished spring, but the price point of the CMMG was much more appealing for a first test. I was cautiously optimistic, hoping that this seemingly minor upgrade would address my rifle’s reliability issues.
Real-World Testing: Putting CMMG, Inc MK3 Action Spring to the Test
First Use Experience
My first test was at my local outdoor range, under relatively ideal conditions: sunny, dry, and moderate temperatures. I installed the CMMG spring in my MK3 rifle, a straightforward process, and loaded up several magazines with various grain weights of .308 ammunition. The initial cycling felt noticeably smoother than with the old spring.
However, after about 50 rounds, I experienced a single failure to extract. This was a slight disappointment, but not entirely unexpected, as action springs often require a brief “break-in” period.
Extended Use & Reliability
After a few more range sessions, totaling approximately 500 rounds, the CMMG spring truly began to shine. The cycling became consistently smooth and reliable. I experienced zero malfunctions, even with lower-powered training ammunition.
After several weeks of use, I began to notice no discernible wear and tear. Routine cleaning and lubrication, as with any AR-10, are essential, but the CMMG spring itself required no special attention. This outperformed my expectations.
Breaking Down the Features of CMMG, Inc MK3 Action Spring
Specifications
The CMMG, Inc MK3 Action Spring is specifically engineered for the CMMG MK3 AR-10 platform rifles. It is designed to ensure proper cycling of the bolt carrier group. This spring is crafted from high-quality spring steel.
The CMMG MK3 Action Spring is designed to factory specifications. This ensures the rifle functions as designed with correct timing.
Performance & Functionality
The CMMG, Inc MK3 Action Spring significantly improves the cycling reliability of my MK3 rifle. The rifle’s failure-to-extract issues have been eliminated since the spring has been used for several range trips. The spring offers smooth cycling and reduces felt recoil.
The CMMG spring does precisely what it is designed to do: reliably cycle the action of a CMMG MK3 rifle. If I were forced to pick a single flaw, it would be a lack of detailed specifications from CMMG regarding spring rate and expected lifespan.
Design & Ergonomics
The CMMG, Inc MK3 Action Spring is a no-frills component, designed for function over form. The quality of the spring steel is quite evident. This contributes to the smooth cycling of the action.
Installation requires basic AR-10 disassembly skills, so there’s a slight learning curve for those new to the platform. However, for experienced users, it’s a drop-in replacement.
Durability & Maintenance
Based on my experiences, the CMMG, Inc MK3 Action Spring will last for many thousands of rounds if properly maintained. Regular cleaning and lubrication are required.
Like any AR-10 component, the CMMG spring should be inspected periodically for signs of wear or damage. But overall, it is a robust and reliable component.
Accessories and Customization Options
The CMMG, Inc MK3 Action Spring is a standalone component and doesn’t directly interface with accessories. However, upgrading to a heavier buffer alongside this spring can further refine the rifle’s cycling characteristics. This can allow the user to tune for specific ammunition types.
CMMG offers a variety of other components for the MK3 platform. Users might consider an enhanced bolt carrier group to further improve reliability.
Pros and Cons of CMMG, Inc MK3 Action Spring
Pros
- Improved cycling reliability for CMMG MK3 rifles.
- Noticeably smoother action compared to worn or generic springs.
- Durable construction using high-quality spring steel.
- Simple drop-in installation for experienced users.
- Affordable price point compared to aftermarket springs.
Cons
- May require a brief break-in period.
- Lacks detailed specifications regarding spring rate and expected lifespan.
Who Should Buy CMMG, Inc MK3 Action Spring?
The CMMG, Inc MK3 Action Spring is perfect for CMMG MK3 AR-10 owners experiencing cycling issues or simply seeking to refresh their rifle’s performance. It’s also a great preventative maintenance item.
Anyone not owning a CMMG MK3 should skip this product. Also those seeking highly tunable aftermarket springs should consider higher end brands.
Must-have modifications include a high-quality buffer and a properly gassed barrel.
Conclusion on CMMG, Inc MK3 Action Spring
The CMMG, Inc MK3 Action Spring is a small but mighty component that significantly improved the reliability of my CMMG MK3 rifle. For a mere $5.99, the price is absolutely justified. I can now run my rifle hard and not worry about failure to extract.
I would absolutely recommend this spring to any CMMG MK3 owner experiencing cycling issues. It’s a simple, affordable, and effective upgrade that can breathe new life into your rifle. Don’t let a worn-out spring ruin your range day – invest in a CMMG MK3 Action Spring and experience the difference.