First Impressions of CMMG Action Spring, Dissent, Mk4
The CMMG Action Spring, Dissent, Mk4 might seem like a small, unassuming part, but it’s a critical component in the reliable cycling of any direct impingement AR-15 platform, especially in the innovative Dissent and Mk4 series from CMMG. As someone who’s spent over a decade in the tactical gear world, I’ve learned that even the smallest parts can have a significant impact on overall performance and reliability. For a mere $7.99, the CMMG Action Spring, Dissent, Mk4 promises to maintain, or even improve, the smooth operation of your CMMG firearm, and that’s a promise worth exploring.
I was drawn to this spring because I was experiencing occasional failures to extract on my CMMG Mk4 pistol chambered in 300BLK. The Mk4 is fantastic for its compact size, but its shorter gas system can sometimes lead to cycling issues, especially with varying ammo types. I wanted a reliable, readily available replacement spring to ensure consistent performance.
My first impression upon receiving the spring was that it looked like… well, a spring. The packaging was basic, as expected for a small component. The spring felt robust and properly wound, with no visible imperfections.
I considered other enhanced buffer springs available from companies like Sprinco, but I opted for the CMMG product initially due to its lower cost and direct compatibility with the CMMG Dissent and Mk4 platforms. Sometimes, sticking with the manufacturer’s parts is the safest bet for optimal performance. Was I excited? Not exactly. But I was cautiously optimistic and ready to see if this small part could solve my cycling issues.
Real-World Testing: Putting CMMG Action Spring, Dissent, Mk4 to the Test
First Use Experience
My first test of the CMMG Action Spring, Dissent, Mk4 was at my local indoor shooting range. I ran approximately 200 rounds of mixed 300BLK ammunition through my CMMG Mk4 pistol, including both supersonic and subsonic loads. The range environment was controlled, with a consistent temperature and minimal dust.
The spring was easy to install, requiring no specialized tools. After installation, I immediately noticed a slightly smoother action when manually cycling the bolt. During live fire, the pistol cycled flawlessly with all ammunition types. There were zero failures to extract or any other cycling malfunctions.
There were no initial surprises; the spring performed exactly as it should, restoring the smooth and reliable operation of my pistol.
Extended Use & Reliability
After several range trips and approximately 1000 rounds fired with the CMMG Action Spring, Dissent, Mk4, I can confidently say it has held up remarkably well. I haven’t noticed any degradation in performance or any signs of premature wear.
I regularly clean my firearms after each range session. The action spring requires minimal maintenance. A quick wipe down with a lightly oiled cloth is all that’s needed to keep it in good condition.
Compared to my previous experience with the original spring, which was exhibiting signs of weakening, the CMMG Action Spring, Dissent, Mk4 has been a noticeable improvement. It has consistently provided reliable cycling, regardless of the ammunition type or shooting conditions. It’s a simple part, but it makes a significant difference.
Breaking Down the Features of CMMG Action Spring, Dissent, Mk4
Specifications
- Manufacturer: CMMG. CMMG is a well-respected name in the AR-15 world, known for quality and innovation, especially with their Dissent and Mk4 platforms.
- Gun Make: AR Platform. Specifically designed for the CMMG Dissent and Mk4 series AR pistols and rifles.
- Caliber: 5.56mm/300BLK. This action spring is designed to function with both 5.56mm NATO and 300 Blackout cartridges in compatible CMMG firearms.
- There are no publicly available specifications like wire gauge or spring rate available. This makes a detailed technical comparison with other springs difficult.
- The finish is a standard phosphate coating for corrosion resistance. This helps protect the spring from rust and wear.
These specifications are important because they ensure the spring is correctly calibrated for the specific demands of the CMMG Dissent and Mk4 platforms. The spring rate needs to be optimized for the gas system length and bolt carrier weight of these firearms to ensure reliable cycling.
Performance & Functionality
The CMMG Action Spring, Dissent, Mk4 performs its job admirably, maintaining consistent cycling and reliable extraction. It has eliminated the occasional failures I was experiencing before.
The strength of this spring lies in its consistency and reliability. Its weakness is the lack of publicly available detailed specifications, which makes it difficult to compare it directly with aftermarket options.
Overall, the spring meets and exceeds my expectations. It has restored my confidence in the reliable operation of my CMMG Mk4 pistol.
Design & Ergonomics
The design of the CMMG Action Spring, Dissent, Mk4 is simple and functional. It’s a standard-looking AR-15 action spring.
The spring is easy to install and requires no special tools or expertise. There’s virtually no learning curve.
Durability & Maintenance
Based on my experience, the CMMG Action Spring, Dissent, Mk4 appears to be a durable component. It shows no signs of wear after significant use.
Maintenance is simple. Regular cleaning of the firearm, including a quick wipe down of the spring, is all that’s required.
Accessories and Customization Options
The CMMG Action Spring, Dissent, Mk4 is a direct replacement part and doesn’t have specific accessories. It works with any standard AR-15 buffer and buffer tube.
While it’s not a customization part itself, it’s a crucial component for ensuring the proper function of a customized CMMG Dissent or Mk4 build. It is compatible with various aftermarket bolts and bolt carriers as long as they are designed for the CMMG platform.
Pros and Cons of CMMG Action Spring, Dissent, Mk4
Pros
- Reliable cycling: Restores and maintains consistent cycling of the CMMG Dissent and Mk4 platforms.
- Direct replacement: Easy to install as a direct replacement for the factory spring.
- Affordable: At $7.99, it’s an inexpensive solution for potential cycling issues.
- Durable: Appears to be made from high-quality materials and shows no signs of wear after extended use.
- Optimized for CMMG Dissent/Mk4: Designed specifically for these platforms, ensuring proper function.
Cons
- Lack of detailed specifications (wire gauge, spring rate) makes comparison with aftermarket springs difficult.
- Basic packaging: No frills, but that’s not really a concern for a functional part.
Who Should Buy CMMG Action Spring, Dissent, Mk4?
This action spring is perfect for CMMG Dissent and Mk4 owners who are experiencing cycling issues, or who simply want to have a spare spring on hand for preventative maintenance. It’s also a good option for anyone building or customizing a CMMG Dissent or Mk4 firearm.
If you are looking for a significant performance upgrade and are willing to spend significantly more, then you might consider looking at enhanced buffer springs from companies like Sprinco. But for most users, the CMMG Action Spring, Dissent, Mk4 is more than sufficient. A must-have accessory would be a basic AR-15 tool kit for easy installation and removal.
Conclusion on CMMG Action Spring, Dissent, Mk4
The CMMG Action Spring, Dissent, Mk4 is a simple, affordable, and effective part that delivers on its promise of reliable cycling. It might not be the most exciting or glamorous component, but it’s a crucial one for ensuring the proper function of your CMMG Dissent or Mk4 firearm.
At $7.99, the price is more than justified. It’s a small investment that can save you a lot of frustration at the range.
I would absolutely recommend the CMMG Action Spring, Dissent, Mk4 to any CMMG Dissent or Mk4 owner. If you’re experiencing cycling issues, or if you simply want to ensure the long-term reliability of your firearm, this spring is a must-have. Don’t let a weak or worn spring ruin your shooting experience. Get a CMMG Action Spring, Dissent, Mk4 and keep your CMMG running smoothly!