The H&K family of roller-delayed firearms includes the following variants: the SP89, the retractable-stock MP5 submachine gun, the 7.62x51 mm G3 rifle, the MP5K machine pistol with vertical fore ...

Heckler & Koch will launch the new SP5K semi-automatic pistol (civilian sporting pistol)—which matches the look and feel of the iconic MP5K submachine gun—at the 2016 NRA Annual Meetings and ...

The SP5K also comes "ready-for-action"in a custom-fitted, lockable, high-quality carrying case, according to H&K officials. The SP5K is slated to be available in July 2016 at a retail price of $2,699.

These guns were easy to suppress, and HK famously produced an integrally suppressed MP5 known as the MP5SD. These were great guns by all standards, but the Navy wanted to test a better submachine gun.