H&K SP5 Pistol Caliber: 9mm x 19 Operating Principle: Recoil operated Locking System: Roller-delayed blowback Magazine Capacity 30 rounds Cartridge case ejection: Right side Length 17.8″ Width 2.48″ Height: 8.66″ Barrel length: 8.86″ Weight (without magazine) 5.1 lb Magazine Weight Empty 30rd-6.3 oz Trigger pull: 6.74-10.11 lb Return Travel .12″ Trigger Travel .24″ Sight Radius 13″ Barrel Profile/Twist: Groove/land profile, 6 grooves, right-hand twist Sights: Rotary rear sights, 4 positions The SP5 was developed by Heckler & Koch as a semiautomatic, civilian sporting pistol that matches the look and feel of the legendary MP5 submachine gun.