The CMMG BANSHEE MK57 Pistol is chambered in 5.7x28mm and built on the Mk57 platform. It uses a radial delayed blowback operating system and is designed to accept FN Five-seveN pattern magazines while retaining AR-15 operational features such as last-round bolt hold open. The platform pairs lightweight handling with a feature set intended for practical, close-range use.
Key Specifications
- Chambered in 5.7x28mm.
- Operates with a Radial Delayed Blowback system.
- Barrel Length is 5.
- Barrel Twist is 1:9.
- Barrel Material is 4140CM SBN.
- Muzzle Device is a CMMG ZEROED Linear Compensator with 1/2 x 28 threads.
- Upper Receiver is Billet 6061 T6 Aluminum.
- Lower Receiver is Mk57 Forged 7075 T6 Aluminum.
- Hand guard is CMMG EML4 M-LOK.
- Magazine is a 20rd Promag.
With the Mk57 platform’s low-recoil 5.7x28mm configuration, billet upper and forged lower construction, M-LOK handguard, and a ZEROED linear compensator, this pistol is built for controllability and modern ergonomics in close-range defensive and practical shooting roles.
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