| Platform | Mk57 |
| Caliber | 5.7x28mm |
| Lower Receiver | Mk57 Forged 7075 T6 Aluminum |
| Finish | Cerakote |
| Pistol Grip | CMMG ZEROED Pistol Grip |
| Buffer Type | Carbine |
| Receiver Extension | Pistol Tube |
| Trigger Type | ZEROED Drop-In Single Stage |
| Trigger Guard | Integrated |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Weight | 2.1 lbs |
| Length | 14.7" |
Please Allow 15-30 Days To Process Your Order.
State/local restrictions may apply in CA, CO, CT, DE, DC, HI, IL, MD, MA, MI, NJ, NY, or WA. Customers must review our Firearms Shipping Policy prior to ordering.
Firearms with attached pistol brace. Please confirm your FFL is accepting transfers for pistol brace equipped firearms prior to ordering.
Lower Group, Pistol, BANSHEE, Mk57, ZEROED Trigger, Pistol Tube
Designed to feed any of our 5.7x28mm upper groups, the BANSHEE™ Mk57™ pistol lower group is feature packed and built with unmatched attention to detail. Whether you have a collection of FN®* Five-seveN®* style magazines already or like the notion of being able to share mags between handgun and personal defense weapon, the Mk57 pistol lower can make it happen. Available in seven different Cerakote finishes, the Mk57 lower comes outfitted with a variety of meticulously crafted CMMG parts and accessories, including:
Oversize Mag Release
We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.
**Mk57 Lowers are designed for use with CMMG 5.7x28mm Radial Delayed Blowback uppers only**
