The CMMG Banshee MK4 Upper Group is a purpose-built .22 LR upper on the Mk4 platform featuring a short 4.50-inch barrel. It is designed to work with any standard AR-15 lower and to use CMMG .22 AR conversion magazines for rimfire operation. The upper group ships complete with a bolt carrier group and ZEROED accessories.
Key Specifications
- This upper is built on the Mk4 platform.
- Chambered in .22 LR.
- The barrel measures 4.50 inches.
- Barrel twist rate is 1:16.
- Barrel material is 4140CM SBN.
- Barrel contour is MT.
- Upper receiver is Billet 6061-T6 aluminum.
- The handguard is a CMMG EML4 M-LOK free-float design.
- The operating system uses traditional blowback.
- Includes a complete bolt carrier group and ZEROED accessories (ambidextrous charging handle, AR-15 polymer dust cover, .22 LR flash hider).
Compact and efficient, this upper group provides a familiar AR-style interface with rimfire economics for training, target work, and recreational shooting. Its short barrel, free-float M-LOK handguard, and included ZEROED components make installation straightforward and allow you to leverage an existing AR-15 lower for low-cost practice while retaining consistent ergonomics and controls.
This description was generated with AI and may contain errors. Verify specifications and legal restrictions with the manufacturer before purchase. Provided “as-is” without warranties or guarantees.
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