What Makes CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver Stand Out?
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver is more than just another AR-platform upper. It’s a meticulously engineered piece designed to deliver the iconic .45 ACP experience in a modern, compact package, expertly crafted by CMMG. What truly sets it apart is its use of CMMG’s Radial Delayed Blowback (RDB) system, a significant advancement over traditional straight blowback designs for .45 ACP ARs, promising reduced recoil and improved reliability.
For years, I’ve been chasing the perfect blend of AR ergonomics with the stopping power of .45 ACP. The straight blowback systems often resulted in heavy, unwieldy platforms with significant recoil; I yearned for something more refined. When I saw the CMMG Banshee incorporating the RDB system, it was an instant must-have, promising a more controlled and enjoyable shooting experience.
The upper arrived well-packaged. My initial impression was that of quality: the Cerakote finish was flawless, the M-LOK handguard felt solid, and the overall fit and finish were impeccable. Picking it up, the weight felt surprisingly manageable, hinting at the benefits of the RDB system in reducing the mass typically associated with .45 ACP AR builds.
I considered several other .45 ACP AR uppers before settling on the CMMG. Many competitors relied on simpler blowback designs, which I knew from past experience would translate to harsher recoil. The CMMG‘s RDB system, coupled with their reputation for quality, swayed my decision, as did the promise of a more compact package due to the efficient action. I was excited to see if it lived up to the hype.
Real-World Testing: Putting CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver to the Test
First Use Experience
My first outing with the CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver was at my local outdoor shooting range. The weather was mild and dry, perfect for putting some rounds downrange. I paired it with a dedicated CMMG MkG lower receiver and a variety of .45 ACP ammunition types, from standard 230-grain FMJ to some hotter self-defense rounds.
The initial impression was overwhelmingly positive. The RDB system lived up to its promise, significantly reducing felt recoil compared to my previous .45 ACP AR pistol builds. The fixed ejector also ensured consistent ejection, a welcome change from the erratic ejection patterns I’d experienced with other .45 ACP ARs.
Extended Use & Reliability
After several months of regular use, the CMMG MkG .45 ACP Banshee has proven to be remarkably reliable. I’ve put several hundred rounds through it, and it has yet to experience any malfunctions directly attributable to the upper itself. Cleaning and maintenance are relatively straightforward.
A quick wipe-down of the bolt and barrel after each range session keeps it running smoothly. So far, the Cerakote finish has held up exceptionally well, showing no signs of wear despite being subjected to the rigors of regular use. It definitely outperforms my previous .45 ACP AR pistol builds in terms of reliability and ease of maintenance.
Breaking Down the Features of CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver
Specifications
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver boasts a number of impressive specifications. It is chambered in .45 ACP with a 1-16 barrel twist rate, ensuring proper stabilization of various .45 ACP bullet weights. The barrel features .578×28 threads per inch, allowing for easy attachment of suppressors or other muzzle devices.
The muzzle device is a CMMG Zeroed Muzzle Brake. The upper receiver is finished in durable Cerakote and constructed from lightweight aluminum. The gas block journal size is .750 in. It also features an M-LOK rail for accessory attachment, and the barrel is made from 4140 Chrome Moly Vanadium steel, promising excellent durability and accuracy. Notably, a magazine is not included.
Performance & Functionality
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver performs exceptionally well, delivering accurate and reliable operation. The RDB system effectively mitigates recoil, making it easier to stay on target for follow-up shots. The fixed ejector ensures consistent ejection, preventing jams and malfunctions.
Its strengths lie in its reduced recoil, reliable operation, and compact size, however, some may find the .45 ACP caliber more expensive to shoot regularly. Overall, the CMMG upper exceeds my expectations.
Design & Ergonomics
The CMMG MkG .45 ACP Banshee is well-designed and ergonomically sound. The M-LOK handguard provides ample space for mounting accessories, and the overall weight is manageable for extended shooting sessions.
The build quality is excellent, with high-quality materials and a durable finish. There is a slight learning curve associated with understanding how the RDB system functions, but it’s relatively easy to grasp with some research and experimentation.
Durability & Maintenance
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver is built to last. The 4140 Chrome Moly Vanadium barrel and durable Cerakote finish should withstand years of regular use.
Maintenance is relatively straightforward, requiring only basic cleaning and lubrication after each range session. The RDB system may require slightly more attention during cleaning than a simple blowback system, but the benefits in performance are well worth the extra effort.
Accessories and Customization Options
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver is highly customizable. The M-LOK handguard allows for easy attachment of various accessories, such as lights, lasers, and foregrips. The threaded barrel accommodates a wide range of muzzle devices, including suppressors.
The upper is compatible with most standard CMMG MkG lowers and accepts Glock .45 ACP magazines. You can add various optics, such as red dot sights or holographic sights to enhance accuracy and target acquisition.
Pros and Cons of CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver
Pros
- Significantly reduced recoil compared to straight blowback .45 ACP ARs.
- Highly reliable operation with the CMMG Radial Delayed Blowback system.
- Durable construction with a 4140 Chrome Moly Vanadium barrel and Cerakote finish.
- M-LOK handguard for easy accessory attachment.
- Accepts Glock .45 ACP magazines.
Cons
- Relatively expensive compared to some other .45 ACP AR uppers.
- .45 ACP ammunition can be more expensive than other pistol calibers.
Who Should Buy CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver?
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver is perfect for shooters looking for a compact and reliable .45 ACP AR pistol or SBR with manageable recoil. This is great for those who want a modern AR platform but want the classic stopping power of the .45 ACP.
Those on a tight budget or those who prioritize simplicity over performance may want to skip this product. A dedicated CMMG MkG lower receiver is a must-have.
Conclusion on CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver is a top-tier option for anyone seeking a .45 ACP AR platform. The RDB system delivers a shooting experience that is noticeably smoother and more controlled than traditional blowback designs. The price is justified by the performance, reliability, and overall quality.
I would wholeheartedly recommend this upper to anyone looking to build a high-performance .45 ACP AR pistol or SBR. If you’re ready to experience the .45 ACP in a whole new way, the CMMG Banshee is definitely worth the investment. Go ahead and build your dream .45 ACP AR with this exceptional upper receiver!