First Impressions of FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits promises to be a one-stop solution for building a reliable and fun 9mm pistol caliber carbine (PCC). As someone with over a decade of experience with AR platforms, particularly in the tactical and competition space, I was eager to see if this kit lived up to the hype. FM Products has a solid reputation, and the promise of a complete, Glock-magazine compatible AR build (minus the lower) piqued my interest.
I was looking for a compact and easily maneuverable platform for close-quarters training and potentially for home defense. The appeal of Glock magazine compatibility was strong, simplifying logistics and utilizing readily available magazines I already owned. My initial impression would be based on build quality and the completeness of the package, considering the $469.00 price tag.
Unboxing the kit revealed a well-organized collection of parts. The FM Products upper receiver assembly looked clean and solid, with the handguard fitting snugly. The included lower parts kit seemed complete, and the heavy buffer and .308 spring suggested FM Products understood the nuances of blowback 9mm AR builds.
Compared to piecing together a similar build from individual parts from various manufacturers, the FM Products kit offered convenience and the promise of matched components. This seemed a better choice than similar kits that are lower priced, but tend to have cheaper, and less thoroughly vetted parts. The kit eliminates the guesswork of ensuring compatibility between parts. My first impression was positive, with a cautious optimism that the kit would perform as well as it looked.
Real-World Testing: Putting FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits to the Test
First Use Experience
My first range trip with the FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits was at an outdoor range, focusing on close-quarters drills. I wanted to assess its accuracy and reliability with various 9mm ammunition types. The weather was dry and sunny, providing ideal conditions for testing.
The initial setup and assembly onto a dedicated 9mm Glock-style lower receiver was straightforward. The rifle cycled well with both 115 grain and 124 grain FMJ rounds, and even seemed to handle 147 grain subsonic rounds with ease. The rear charging handle felt smooth and intuitive, and it allowed me to stay on target when manipulating the rifle.
During the initial 200 rounds, I experienced one failure to feed, which I attributed to a slightly worn Glock magazine. After switching to a newer magazine, the rifle ran flawlessly. I was surprised by the minimal recoil for a blowback system, thanks to the heavy buffer.
Extended Use & Reliability
After several months and approximately 1000 rounds, the FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits has proven to be quite reliable. I’ve used it in various drills and competitions, and it consistently performs well. Regular cleaning and lubrication, especially of the bolt carrier group, are crucial for optimal performance.
The finish on the upper receiver and handguard has held up well, with only minor wear marks visible in high-friction areas. The Melonite coating on the barrel still looks great. The rifle has required minimal maintenance beyond standard cleaning and lubrication.
Compared to my previous 9mm AR builds using mismatched components, the FM Products kit offers a noticeable improvement in reliability and consistency. It gives me confidence in its functionality and durability. It has definitely exceeded my expectations by being a complete kit that I just needed to assemble, rather than spending hours trying to find compatible parts.
Breaking Down the Features of FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits
Specifications
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits boasts several key specifications. It is chambered in 9mm Luger. The barrel is a Match Grade 41V50 steel, 5 inches in length, with a 1:10 twist rate and 1/2-36 TPI muzzle threads.
These specifications are crucial for accuracy, reliability, and compatibility with various muzzle devices. The 41V50 steel barrel ensures durability and longevity. The 1:10 twist rate stabilizes most 9mm projectiles, and the thread pitch allows for easy attachment of suppressors or muzzle brakes.
Performance & Functionality
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits performs admirably in its intended role. It offers good accuracy out to 50 yards, and its reliability is commendable with quality magazines and ammunition. The heavy buffer and .308 spring effectively mitigate recoil, making it comfortable to shoot for extended periods.
One strength is the rear charging handle, which allows for quick and easy manipulation without breaking the cheek weld. A minor weakness is the non-standard 1/2-36 thread pitch, which limits the choice of readily available muzzle devices. Overall, the kit meets and mostly exceeds expectations.
Design & Ergonomics
The FM Products kit features a well-designed upper receiver with a monolithic-style interlock between the upper and handguard. This provides a rigid and stable platform for optics and accessories. The slim-line M-LOK compatible handguard offers ample space for mounting lights, lasers, and other attachments.
The build quality is excellent, with high-quality materials and tight tolerances. The kit has a comfortable weight, making it easy to handle and maneuver. The learning curve is minimal for those familiar with the AR platform, and the rear charging handle is intuitive.
Durability & Maintenance
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits is built to last. The 41V50 steel barrel and Melonite-coated bolt carrier group are resistant to wear and corrosion. Proper maintenance involves regular cleaning and lubrication.
I expect this kit to last for many years with proper care. The components are easily accessible for maintenance and repair. The lifetime of the barrel should be comparable to that of any quality AR barrel.
Accessories and Customization Options
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits comes with a thread protector and a FM Products Micro Brake. The M-LOK handguard allows for the attachment of various accessories such as lights, lasers, and vertical grips. The kit is compatible with any standard Glock-style 9mm lower receiver.
The kit readily accepts aftermarket triggers, pistol grips, and other AR-15 compatible components. However, due to the proprietary thread pitch on the barrel, users are limited to muzzle devices with 1/2-36 threads. Fortunately, most suppressors can be adapted to this thread pitch with the correct adapter.
Pros and Cons of FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits
Pros
- The kit provides a complete and reliable 9mm AR build solution, minus the serialized lower receiver.
- It has a high-quality barrel and bolt carrier group for enhanced accuracy and longevity.
- The rear charging handle allows for easy and intuitive manipulation.
- The heavy buffer and .308 spring effectively mitigate recoil, making it comfortable to shoot.
- The Glock magazine compatibility simplifies logistics and utilizes readily available magazines.
Cons
- The proprietary 1/2-36 thread pitch on the barrel limits muzzle device options.
- The user feedback shows swapping out muzzle devices can be difficult, so you have to clamp down to swap muzzle devices.
Who Should Buy FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits?
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits is perfect for:
- Competitive shooters looking for a reliable and accurate PCC platform.
- Home defense enthusiasts seeking a compact and easily maneuverable 9mm AR pistol.
- AR-15 enthusiasts wanting to build a dedicated 9mm Glock-magazine compatible AR.
This product may not be ideal for those seeking absolute parts interchangeability with all AR-15 components, due to the proprietary barrel thread pitch. Someone who just wants a fun range toy might find more budget-friendly options. A must-have accessory is a high-quality Glock magazine to ensure reliable feeding.
Conclusion on FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits
The FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits offers a compelling package for building a reliable and accurate 9mm AR pistol. The price of $469.00 is justified by the quality of the components and the convenience of a complete kit. The rear charging handle and Glock magazine compatibility are welcome features.
I would personally recommend this kit to anyone looking for a high-quality 9mm AR build. While the proprietary thread pitch on the barrel is a minor drawback, the overall performance and reliability of the kit outweigh this limitation. Build your dream 9mm AR today!