Since the MP5 is generally illegal for people to buy in the United States, Heckler & Koch designed the SP5 in 2019, as a semiautomatic, civilian sports pistol that resembles the iconic MP5 submachine gun. The SP5 is packed with authentic characteristics, including a Navy barrel with a threaded tri-lug adapter, a paddle magazine release, and a fluted chamber. It was designed and built to meet the standards of a civilian pistol. The height, weight, function, and feel of the SP5 are extremely identical to those of the MP5, and it is completely ambidextrous for simple handling. The roller-delayed blowback operating system, which is known for its accuracy, dependability, and smooth shooting dynamic, is the SP5's core component. The SP5 comes with a flexible "bungee" sling for more comfortable shooting. Using the sling increases stability and decreases fatigue when firing the SP5. The HK SP5 is equipped with the unique MP5 threaded 3-lug barrel, which is composed of cannon-grade steel and cold-hammer-forged. The barrel threading is designed to accommodate practically all suppressor models available today. To increase its effectiveness, the SP5 can be equipped with a broad range of aftermarket accessories. The SP5L was developed by Heckler & Koch as a semiautomatic, civilian sporting rifle with a prolonged, 16.5-inch barrel, and a chrome-lined bore.