0909162223bmod October 18, 2016 at: 1500 × 844 In: Modern Personal Defense Weapon Calibers 001: Introduction, and the 5.7x28mm FN Next → Four PDW calibers: .22 WMR (Kel-Tec CMR-30 and PMR-30 SMG), .22 SCAMP (Colt SCAMP), 5.7x28mm FN (FN P90), and 4.6x30mm HK (HK MP7).