Moriarti AR-15 Hammer Spring Review

Putting the Moriarti AR-15 Hammer Spring Through Its Paces

My AR-15 platform has always been a canvas for refinement, a testament to the modularity that makes it so enduring. Over the years, I’ve swapped triggers, upgraded springs, and meticulously tuned countless components to achieve peak performance. It was during one such session, aiming to perfect the trigger pull even further, that I found myself needing a reliable hammer spring. The stock spring in my build, while functional, felt a touch light, and I was chasing that crisp, consistent break that separates a good trigger from a great one. This is where the Moriarti AR-15 Hammer Spring entered the picture.

Sourced from Moriarti, a manufacturer that promises durable components, this particular spring arrived in a simple, no-frills package. My initial impression upon unboxing was one of understated quality. The steel had a consistent finish, free from any obvious blemishes or rough edges, which is precisely what you want in a critical ignition component. While I considered a few other options, including higher-end, individually tuned springs, the price point of this Moriarti offering was simply too compelling to ignore for what is essentially a foundational piece of the AR-15’s fire control group. There was a quiet sense of satisfaction knowing I was addressing a subtle but important aspect of the firearm’s function without breaking the bank.

Real-World Testing: Putting Moriarti AR-15 Hammer Spring to the Test

My testing environment is primarily my personal workshop and, crucially, the shooting range. The AR-15 platform demands a certain level of reliability that only direct application can verify. Swapping out the existing hammer spring was a straightforward process, a familiar dance of disassembling the lower receiver and carefully manipulating the trigger and hammer components.

First Use Experience

The initial installation of the Moriarti AR-15 Hammer Spring was uneventful, which is precisely how one wants firearm component replacements to be. I conducted the swap on my workbench, surrounded by the familiar scent of gun oil and the organized clutter of my tool collection. The spring slid into place with the expected tension, providing a satisfying, solid feel without any binding.

Upon reassembly, I performed several dry-fire checks. There was an immediate, albeit subtle, difference in the trigger pull. It felt a touch firmer, more resolute, suggesting a more consistent energy transfer to the hammer. The real test, of course, came at the range. I loaded a few magazines and began cycling through live fire. The crucial factor was ignition; did this spring consistently provide enough force to set off primers? Across various ammunition types, from commercial 5.56 NATO to some older reloads, every round ignited on the first strike. This is a critical performance metric for any hammer spring, and this Moriarti component passed with flying colors, even under the stress of rapid firing drills.

Extended Use & Reliability

Weeks have now passed since I first installed the Moriarti AR-15 Hammer Spring, and it has seen significant use. My AR-15 is not a safe queen; it’s a tool that gets used. I’ve run several hundred rounds through it since the swap, including during a recent extended range day where the rifle saw continuous fire for over an hour. This included periods of rapid fire, which generate heat and stress on all components.

During this extended use, the hammer spring has maintained its consistent performance. There have been no signs of degradation in its ability to reliably ignite primers. I’ve also noted no unusual wear on the hammer or the trigger group components that could be attributed to the spring. It has held up admirably against the usual rigors of shooting, including exposure to typical workshop dust and the occasional light spray of cleaning solvent. Compared to some lesser-quality springs I’ve encountered in the past, which can sometimes develop a ‘soft spot’ or become less consistent over time, this Moriarti part feels robust. Maintenance has been minimal, essentially just part of the standard rifle cleaning routine. A quick wipe-down during general cleaning is all that’s been required.

Breaking Down the Features of Moriarti AR-15 Hammer Spring

Specifications

The Moriarti AR-15 Hammer Spring is a component designed for the AR-15 platform and its derivatives. Manufactured by Moriarti, its primary material is steel, ensuring inherent strength and durability. The color is described as “Steel,” indicating a natural metal finish.

• Manufacturer: Moriarti
• Color: Steel
• Gun Type: Rifle
• Gun Make: AR Platform
• Fabric/Material: Steel

These specifications are straightforward but critical for its function. The steel construction is paramount; it needs to be strong enough to reliably strike the firing pin with sufficient force to detonate a primer, yet flexible enough to resist fracturing under repeated stress. For an AR-15 platform, ensuring compatibility is also key, and this spring is designed specifically for that purpose. The straightforward “Steel” color signifies a focus on function over aesthetics, which is typical for internal components where appearance is secondary to performance.

Performance & Functionality

The primary job of a hammer spring is to store and release energy to drive the hammer forward with enough velocity to strike the firing pin. The Moriarti AR-15 Hammer Spring excels at this fundamental task. It provides a consistent and robust energy transfer, leading to reliable ignition across a wide range of ammunition types.

Its main strength lies in its unwavering reliability. In my testing, it has consistently struck primers with enough force to ensure ignition, a critical function that cannot be overstated. There have been no light primer strikes, a common failure point with inferior springs. The spring’s performance feels solid and dependable, contributing to the overall smooth operation of the trigger group. It’s the kind of component you install and then forget about because it just works.

Design & Ergonomics

While a hammer spring is an internal component and doesn’t have direct “ergonomics” in the way a grip or trigger shoe does, its design has implications for the feel of the trigger pull. The Moriarti AR-15 Hammer Spring contributes to a trigger pull that feels slightly heavier and more deliberate than some lighter factory springs. This isn’t a negative; for many AR-15 users, a slightly firmer pull can actually enhance control and reduce accidental discharges.

The build quality is evident in the uniformity of the steel and the absence of any burrs or rough spots that could interfere with its movement within the receiver. The spring’s diameter and length are precisely manufactured to fit within the AR-15 hammer mechanism without binding. This attention to detail in manufacturing ensures it operates smoothly within the confines of the trigger group.

Durability & Maintenance

Given its simple, solid steel construction, the Moriarti AR-15 Hammer Spring is built for longevity. Springs are inherently cyclical components, experiencing stress with every hammer fall. However, high-quality steel and proper manufacturing processes allow them to endure tens of thousands of cycles without significant degradation.

I anticipate this Moriarti spring to last the practical lifespan of the firearm it’s installed in under normal use. Its maintenance is essentially zero beyond the standard cleaning and lubrication of the rifle’s fire control group. It’s not a part that requires special care; it simply needs to be present and functional. Any potential failure would likely manifest as a loss of energy (light primer strikes) or, more rarely, a fracture, neither of which has occurred in my experience.

Accessories and Customization Options

As an internal component, the Moriarti AR-15 Hammer Spring does not come with accessories, nor does it offer direct customization options itself. Its role is to integrate seamlessly with the existing trigger and hammer components of the AR-15 platform. However, its value is amplified when paired with other compatible trigger group enhancements.

For instance, when used with a quality aftermarket trigger group or a polishing kit for the hammer and sear surfaces, this spring can contribute to an even more refined trigger pull. Its ability to provide consistent force ensures that any improvements made to other parts of the trigger mechanism are fully realized. It’s designed to work within the established AR-15 ecosystem, accepting standard trigger pins and hammer dimensions.

Pros and Cons of Moriarti AR-15 Hammer Spring

Who Should Buy Moriarti AR-15 Hammer Spring?

This Moriarti AR-15 Hammer Spring is an ideal component for a wide range of AR-15 owners. It is particularly well-suited for DIY gunsmiths and enthusiasts who are building their own rifles from parts or performing routine maintenance and upgrades. If you’re experiencing light primer strikes with your current setup, or simply want a more consistent and robust ignition source, this spring is a great choice.

It’s also an excellent option for those who might be replacing worn-out parts in an older rifle or looking for a cost-effective way to improve the reliability of their firearm without resorting to expensive, high-end trigger kits. Anyone seeking a dependable, no-nonsense hammer spring that simply works will find great value here.

You should likely skip this product if you are looking for a specialized, ultra-light competition trigger spring designed for extreme sensitivity. While this spring offers reliability, it is a standard-weight component that contributes to a firm, positive hammer fall. For those situations, a different type of spring would be more appropriate. For its intended purpose, however, it is excellent. A basic AR-15 maintenance kit with punches and a hammer would be beneficial for installation.

Conclusion on Moriarti AR-15 Hammer Spring

The Moriarti AR-15 Hammer Spring delivers exactly what it promises: reliable, durable performance at an incredibly accessible price point. It’s a foundational component for any AR-15 platform, and Moriarti has produced a part that meets and often exceeds the requirements for consistent ignition. My real-world testing confirmed its ability to reliably set off primers across various ammunition types, even under strenuous conditions.

For its modest cost, the value proposition here is exceptionally strong. You’re getting a part that contributes significantly to the firearm’s core functionality without any unnecessary frills. It’s a testament to the fact that sometimes, the simplest solutions are the most effective. I would readily recommend this Moriarti AR-15 Hammer Spring to anyone looking for a dependable replacement or upgrade part for their AR-15. It’s a smart buy for anyone prioritizing functionality and reliability on a budget.