CMMG MK4 Banshee 100 MK4 8" 5.7x28 Pistol with 20 round magazine and original box. This small caliber hybrid round is known for its low recoil and high velocity with a pretty flat trajectory path. Keeps this cartridge one of the most popular rounds on the market. Stop by and check it out Monday-Saturday 10am-6pm at 895 South Wickham Rd West Melbourne FL 32904. Any questions please give us a call 321-728-7296 Best Pawn Layaway, Shipping and Trades are available.