The most widely sought HK MP5 variant, the MP5A3 was first developed by Heckler & Koch in the mid-1960s. This 9 mm submachine gun uses the same delayed blowback operating system found on the famous HK G3 automatic rifle. Reliability, accuracy, ease of handling, simple maintenance, and safety — all the elements of HK excellence are highlighted on the MP5. Firing from the closed-bolt position in all modes of fire make MP5 submachine guns extremely accurate and controllable.

All HK MP5 models are manufactured using time-tested Heckler & Koch technological invocation and superior materials. Barrels are made using cold hammer forging, a process pioneered and perfected by HK. Machined and stamped high strength steel and modern polymers make up the rest of the MP5. Continual product improvements over more than 50 years of production have kept the MP5 up-to-date and technologically current; it is firmly established as the world’s pre-eminent submachine gun among military and law enforcement users.

Over 120 MP5 variants are available to address the widest range of tactical requirements. A selection of optional trigger groups allow for single fire only, full automatic, 2-round, and 3-round burst options. The weapon’s unique modular design and a variety of optional buttstocks, forearms, sight mounts, magazines, and other accessories gives the MP5 extraordinary flexibility to meet most any mission requirement. In the U.S. MP5 models with an “A3” suffix have retractable buttstock.

MP5 Mid Life Improvement (MLI) models are available by special order. MP5 MLI models have a new accessory rail handguard and scope mount rail as well as the same modular design features and components that allow any basic MP5 to be easily re-configured into a multitude of variants by simple swapping of buttstocks, trigger mechanisms, forearms, and adding other accessories like suppressors, optics, lights, and laser aimers. Available in European RAL8000 (brown/ green) color scheme or conventional black finish.

Principal configurations of the MP5A3 (retractable buttstock variant) available from HK-USA include the following (all caliber 9 x 19mm and supplied with one 30-round magazine and sling):


090042-A5 MP5A3(SF) Submachine Gun with SF trigger group

090019-A5 MP5A3(NT) Submachine Gun with Navy trigger group

701886-A5 MP5A3(012) Submachine Gun with 0-1-2 trigger group

090023-A5 MP5A3(013) Submachine Gun with 0-1-3 trigger group

214079-A5 MP5A3(2RB) Submachine Gun with 2-round burst trigger group

090013-A5 MP5A3(3RB) Submachine Gun with 3-round burst trigger group

081200-A5 MP5N Submachine Gun with with Navy trigger group, threaded barrel


MP5 Trigger Groups (All trigger groups except SEF have ambidextrous selector levers, SEF trigger group for right hand user only)


SEF…0-1-D trigger group  (Safe, Semi-automatic, Full Automatic)

SF…0-1 trigger group (Single Fire i.e. Safe, Semi-automatic)

NT…0-1-D trigger group (Navy Trigger i.e. Safe, Semi-automatic, Full Automatic)

012 …0-1-2 (Safe, Semi-automatic, 2-Round burst)

013…0-1-3 (Safe, Semi-automatic, 3-Round burst)

2RB…0-1-2D (Safe, Semi-automatic 2-Round burst, Full Automatic)

3RB…0-1-3D (Safe, Semi-automatic 3-Round burst, Full Automatic)






CaliberLengthHeightWidthBarrel LengthSight Radius
9 mm x 1921.69 in9.06 in1.97 in8.86 in13.39 in


CaliberWithout MagazineMagazine (empty)
9 mm x 196.45 lbs0.37 lbs


CaliberOperating PrincipleMagazine CapacityModes of fireRate of fireSightsButtstock
9 mm x 19roller-delayed blowback30 rd • 15 rdsingle, full-auto, 2-rd. burst, 3-rd. burst800diopterretractable