JK Army shows the H&K Umarex VFC MP5, MP5K, SD3 SMG GBB series that they carry at their store that includes parts and accessories. This GBB series is comprised of licensed replicas by Umarex with authentic H&K markings and engravings. Featuring the latest 2024 version, it boasts enhanced recoil buffer and spring, a brand new design hop-up adjustment system, redesigned bolt carrier assembly, increased cylinder size for better performance, steel stamping upper receiver, early style SEF grip module, retractable stock, and a steel stamping 30 rounds MP5 gas magazine.