Smith & Wesson MP AR OOPS Kit Review

One Week with the Smith & Wesson MP AR OOPS Kit

The bane of any AR platform enthusiast’s existence is the sheer number of tiny, easily misplaced springs, pins, and detents that constitute the lower receiver. It’s an almost universal rite of passage: during a build or a teardown, one of these minuscule components decides to explore the carpet fibers, the garage floor, or even, as one user eloquently put it, the stratosphere. That’s precisely where the Smith & Wesson MP AR OOPS Kit enters the picture. This thoughtfully curated collection of small but vital parts aims to be the antidote to those frustrating moments of hunting for a lost piece. My own journey to this kit began innocently enough, during a routine cleaning and upgrade session on a trusted AR build. A spring, no bigger than a grain of rice, vanished into the ether, halting my progress and necessitating a week-long wait for a replacement. The sheer inefficiency and aggravation sparked the realization that a preventative measure was in order. While I considered sourcing individual parts from various online vendors, the convenience and apparent completeness of a dedicated kit like this one from Smith & Wesson quickly became appealing. My initial impression upon opening the package was one of organized utility. The small, resealable bag contained a surprisingly comprehensive assortment of the very parts that tend to disappear. It felt like a small but significant victory against the chaos of firearm maintenance.

Real-World Testing: Putting Smith & Wesson MP AR OOPS Kit to the Test

First Use Experience

My testing ground for this kit was my dedicated workshop, the usual battlefield for firearm maintenance and upgrades. The scenario was simple: I’d deliberately set aside a few common, easily lost parts from a spare lower receiver build to simulate a “lost part” situation. My goal was to see if the kit could seamlessly integrate into an ongoing project without causing further delays or requiring extensive modification. I needed to replace a bolt catch roll pin and a buffer retainer spring that I had “misplaced” (read: dropped behind my workbench). The parts from the Smith & Wesson MP AR OOPS Kit slid into place with satisfying precision. The roll pin tapped in smoothly, and the buffer retainer spring provided just the right amount of tension.

The kit proved remarkably intuitive to use; there was no learning curve, just the immediate ability to grab the needed component and get back to work. The primary surprise was the sheer completeness of the kit. It contained duplicates of nearly every small pin and spring that constitutes the typical lower receiver, anticipating the most common “oops” moments.

Extended Use & Reliability

Over several weeks, this kit became an indispensable part of my workbench. It lived in a readily accessible compartment of my range bag, and I even kept one in the storage compartment of my rifle’s pistol grip. During an impromptu range day where I decided to swap out a trigger group, two tiny detent springs suddenly escaped their confinement. Within seconds, I had retrieved the Smith & Wesson MP AR OOPS Kit, located the correct springs, and my work continued without interruption.

The durability of the components is surprisingly robust for such small items. Despite being handled frequently, tapped into place, and subjected to the occasional accidental drop onto my workbench (which, in itself, is a testament to their existence – they’re often lost because they fall!), none of the parts have shown any signs of premature wear or compromise in function. Cleaning is straightforward as these are typically not parts that get heavily soiled, but a quick wipe down is all that’s ever needed.

Compared to the few generic springs and pins I’ve purchased in the past, which sometimes felt slightly undersized or made of inferior metal, the quality here is noticeably higher. There’s a tangible difference in the finish and the precise dimensions of these small parts.

Breaking Down the Features of Smith & Wesson MP AR OOPS Kit

Specifications

The Smith & Wesson MP AR OOPS Kit is a curated collection of essential small parts designed specifically for the AR platform. It includes a comprehensive list of components crucial for lower receiver assembly and maintenance. This vital kit contains: Bolt Catcher Plunger, Bolt Catch Spring, Bolt Catch Roll Pin, Buffer Retainer, Buffer Retainer Spring, Disconnector Spring, Hammer Spring, Trigger Spring, Hammer Pin, Trigger Pin, Pivot Pin Detent, Pivot Pin Detent Spring, Takedown Pin Detent, Takedown Pin Detent Spring, Selector Detent, Selector Detent Spring, Trigger Guard Roll Pin, and Magazine Catch Spring.

These components are manufactured to meet the specifications required for reliable function within an AR-15 lower receiver. The inclusion of both springs and pins ensures that nearly any small part that might go astray during a build or disassembly has a replacement readily available. This kit provides a crucial safety net for firearm enthusiasts, preventing the need to halt projects due to a lost item. The trigger guard roll pin, for instance, is often a fiddly part to install, and having a spare can save significant frustration.

Performance & Functionality

The primary job of the Smith & Wesson MP AR OOPS Kit is to provide functional replacements for small, easily lost AR-15 lower receiver parts. In this regard, it performs exceptionally well. Each component is manufactured to a standard that allows it to function as intended, integrating seamlessly into standard AR-15 lower receivers. The springs provide appropriate tension, and the pins seat correctly without excessive force or looseness.

The main strength of this kit is its sheer comprehensiveness; it anticipates the most common items lost during builds or maintenance. Its functionality lies in its availability – having the right part when you need it. The only potential weakness, inherent to the nature of such small parts, is that they can still be dropped and lost if not handled carefully, but the kit itself mitigates this by providing spares. It meets and often exceeds expectations by offering a full suite of these tiny, critical pieces.

Design & Ergonomics

The design of the Smith & Wesson MP AR OOPS Kit is purely utilitarian, which is exactly what’s needed for this type of product. The components themselves are standard in their design for AR platforms, ensuring compatibility. They are presented in a simple, resealable plastic bag, which, while not fancy, is practical for storage and preventing further loss.

Ergonomically, the kit itself doesn’t have “ergonomics” in the traditional sense, but the design of the individual parts is critical. The pins have appropriate chamfering, and the springs have the correct coil count and tension. The selector detent spring, for example, is designed to fit precisely within its channel to provide the correct detent action. The overall feel of the components, even the small pins, is one of solid metal construction, not flimsy or easily bent.

Durability & Maintenance

The durability of the individual parts within the Smith & Wesson MP AR OOPS Kit is excellent for their intended purpose. These small metal components are unlikely to break or wear out under normal AR-15 maintenance and operation cycles. They are designed to be installed and remain in place, only being removed for maintenance or part replacement.

Maintenance is minimal; typically, a quick wipe with a lightly oiled cloth is sufficient if they become dusty or are exposed to any moisture. The primary concern with these parts isn’t their durability but their tendency to be misplaced. The kit itself, being a resealable bag, helps with organization and prevents external damage. A potential concern, though minor, is that the small roll pins could potentially deform if forced into an ill-fitting hole, but this is more user error than a product flaw.

Accessories and Customization Options

The Smith & Wesson MP AR OOPS Kit is designed as a self-contained solution, meaning it doesn’t typically come with additional accessories. Its purpose is to be the accessory for your AR build or repair. There are no real customization options for the parts themselves, as they are standard components designed for a specific firearm platform.

However, the kit itself can be considered an accessory for your toolkit. For enhanced organization, some users might choose to transfer the contents into a small compartmentalized parts organizer or a pill case, especially if they keep multiple kits. The trigger guard roll pin and the various detent springs are among the most frequently used items in such a kit, making them easily accessible in a well-organized container.

Pros and Cons of Smith & Wesson MP AR OOPS Kit

Who Should Buy Smith & Wesson MP AR OOPS Kit?

This kit is an absolute must-have for anyone who regularly builds, disassembles, or maintains AR-15 pattern rifles. This includes home gunsmiths, enthusiasts who enjoy customizing their firearms, and even those who perform routine cleaning and maintenance. It’s particularly valuable for anyone who has ever experienced the sheer frustration of losing a tiny component.

Those who should probably skip this kit are individuals who only send their firearms to a professional gunsmith for all work and never touch the internal components themselves. For everyone else, it’s a wise investment. A highly recommended complementary item would be a small parts tray or a compartmentalized organizer box for superior long-term storage and easier identification of specific components within the kit.

Conclusion on Smith & Wesson MP AR OOPS Kit

The Smith & Wesson MP AR OOPS Kit is a practical, well-executed solution to a common problem faced by AR-15 owners. For its modest price of $15.95, it delivers exceptional value by providing peace of mind and a crucial fallback when small parts inevitably go astray. The quality of the components is solid, ensuring that when you do need them, they’ll perform as expected without issue. It’s not a revolutionary product, but it’s an essential one for anyone who works on their AR-15. I would absolutely recommend this kit to any builder or tinkerer. It’s the kind of item that sits in your toolkit, waiting patiently, and when you need it, you’ll be incredibly grateful you have it.