CMMG, Inc AR-15 Action Spring Review

Why the CMMG, Inc AR-15 Action Spring Might Be Right for You

The CMMG, Inc AR-15 Action Spring is a fundamental component for any AR-15 platform owner, a crucial piece that ensures smooth and reliable cycling of the firearm. My personal journey with this particular spring began out of necessity, spurred by a persistent cycling issue during a critical moment on the range. It wasn’t a dramatic malfunction, but a subtle, almost imperceptible hesitation that hinted at a weakening part. This subtle hint was enough for an experienced gear specialist to take notice and seek a reliable replacement.

Upon receiving this CMMG, Inc AR-15 Action Spring, my initial impression was one of quiet competence. It arrived as a simple, coiled piece of metal, yet the quality of the manufacturing was immediately apparent. The material felt robust, and the spring’s tension seemed consistent and appropriate for its intended application. I had briefly considered a generic replacement from a less established brand or even salvaging an older spring, but the reputation of CMMG for producing quality AR-15 components swayed my decision. My first reaction was a sense of quiet confidence that I had made the right choice for a critical firearm part.

Real-World Testing: Putting CMMG, Inc AR-15 Action Spring to the Test

First Use Experience

My initial testing took place at a familiar outdoor shooting range, a place where consistency and reliability are paramount. I performed a direct swap with the old spring in my AR-15 build. The replacement process itself was straightforward, a testament to the standardized nature of AR-15 components.

The new spring immediately brought about a noticeable improvement in the firearm’s operation. The cycling felt crisper, more decisive, and the hesitation I had previously experienced was completely gone. I fired approximately 100 rounds in various rapid-fire sequences and single shots. Throughout this session, the action spring performed flawlessly, handling the stresses of repeated cycling without any signs of faltering.

Extended Use & Reliability

Weeks turned into months, and this replacement spring became a permanent fixture in my rifle. It has seen service across numerous range days, some of which involved extended shooting sessions where the rifle became quite warm. I also subjected it to varying environmental conditions, from dry, dusty afternoons to a light morning drizzle, all without any degradation in performance.

Visually, the spring shows no signs of premature wear, such as permanent set or deformation, even after hundreds of cycles. Its maintenance has been almost non-existent; a basic cleaning of the bolt carrier group, which incidentally includes the action spring, is all that’s required. Compared to budget springs I’ve used in the past, which sometimes developed a noticeable limp after prolonged use, this CMMG unit has maintained its resilience and original tension remarkably well.

Breaking Down the Features of CMMG, Inc AR-15 Action Spring

Specifications

The CMMG, Inc AR-15 Action Spring is, by definition, a single, vital component. Its core specification is its material composition and its precise spring rate, designed to function within the established tolerances of the AR-15 platform. While specific tensile strength or coil count aren’t typically advertised for such a part, its performance is the ultimate indicator.

• Manufacturer: CMMG – A name synonymous with quality AR-15 components, their commitment to precision manufacturing is evident.
• Gun Model: AR-15 – This specifies its intended application, ensuring compatibility with the vast majority of AR-15 pattern rifles.
• Condition: New – Arriving in optimal condition, ready for immediate installation and use.

The simplicity of its design belies its importance; a correctly tensioned spring is fundamental to the semi-automatic function of an AR-15. An under-tensioned spring can lead to cycling failures, while an over-tensioned one might cause excessive wear on other components. The CMMG spring strikes a perfect balance.

Performance & Functionality

The primary job of an action spring is to provide the necessary force to return the bolt carrier group forward after firing. This CMMG, Inc AR-15 Action Spring performs this task with exceptional efficacy. It reliably strips a fresh round from the magazine and chambers it, ensuring continuous firing capability.

Its main strength lies in its consistent performance across a wide range of firing rates and conditions. I haven’t encountered any feeding issues or short-stroking since its installation, which were problems I occasionally experienced with lesser springs. A minor, almost imperceptible weakness could be its lack of advanced features, but for a utilitarian part like this, that’s hardly a detractor; its strength is its reliable simplicity. It meets, and arguably exceeds, expectations for a part of its nature, especially considering its modest price point.

Design & Ergonomics

The design of an action spring is inherently functional, focused on coiled wire geometry rather than aesthetics or comfort. The CMMG, Inc AR-15 Action Spring is crafted from a high-quality steel alloy, which contributes to its perceived sturdiness and durability. The finish is a standard utilitarian coating, designed for corrosion resistance rather than visual appeal.

While there are no “ergonomic” considerations in the traditional sense for a spring, its uniformity in coil spacing and diameter is crucial for consistent tension. This ensures it seats properly within the buffer tube and correctly interacts with the bolt carrier group. There is no learning curve involved; it’s a direct drop-in replacement.

Durability & Maintenance

Given its intended purpose within the AR-15 platform, this action spring is designed for a long service life. Under typical use, it should easily last thousands of rounds, if not the entire lifespan of the rifle’s other components. It’s a wear part, but a very robust one.

Maintenance is virtually non-existent beyond the general cleaning of the bolt carrier group and buffer assembly. A light application of lubricant during BCG cleaning is sufficient. There are no specific maintenance tips to share, as its design makes it largely self-sufficient. I have not encountered any failure points, and given CMMG’s reputation, it’s unlikely I will experience any premature issues.

Accessories and Customization Options

As a core internal component, the CMMG, Inc AR-15 Action Spring itself is not typically accompanied by accessories or offering customization options in the traditional sense. However, it is designed to work seamlessly with a standard AR-15 buffer tube and bolt carrier group.

While there aren’t direct “accessories” for the spring itself, its compatibility with the broader AR-15 ecosystem is a significant benefit. It integrates perfectly with aftermarket buffer tubes and bolt carrier groups, making it a versatile choice for various builds. The key “accessory” is, of course, the buffer itself, which works in tandem with the spring.

Pros and Cons of CMMG, Inc AR-15 Action Spring

Who Should Buy CMMG, Inc AR-15 Action Spring?

This CMMG, Inc AR-15 Action Spring is an ideal choice for virtually any AR-15 owner, whether they are building a new rifle, replacing a worn-out part, or seeking to upgrade from a questionable generic component. It’s perfect for range enthusiasts, competition shooters, and anyone who prioritizes dependability in their firearm. Professional firearm technicians and gunsmiths will also appreciate its consistent quality.

Individuals who might consider skipping this are those looking for a “performance” upgrade in a spring that doesn’t exist, or perhaps those building an AR-15 with highly specialized, non-standard buffer systems that require unique spring rates. For most, however, this is a straightforward, high-quality replacement. A buffer tube, bolt carrier group, and proper lubricant are essential complementary items for any AR-15 build where this spring will be installed.

Conclusion on CMMG, Inc AR-15 Action Spring

The CMMG, Inc AR-15 Action Spring is a testament to the fact that sometimes, the most critical components are also the simplest. Its performance has been flawless, its durability unquestionable, and its integration into my AR-15 platform seamless. For its modest price, the value it delivers in terms of reliability and peace of mind is substantial.

I would absolutely recommend this spring to anyone looking for a dependable replacement or upgrade. It’s not a flashy component, but it’s one that performs its vital duty without fail. If you own an AR-15, investing in a quality action spring like this one from CMMG is a smart decision for ensuring the continued smooth operation of your firearm.