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The HK78UK is the UK branch's entry into the submachine gun market, albeit the "upper-crust" market. This is what is considered the "Rolls-Royce" of submachine guns, with the features this weapon has. First off, the weapon fires 9mm caseless ammunition, with the high capacity ammo clip holding 45 rounds.

The weapon uses a rather different approach to maintain it's small size. Instead of a 'typical' ammunition clip, it is fed from a hopper that is built inside of the sliding stock. The rounds are stored perpendicular (like the FN P90) and fed through a special extraction system. The rounds are stored in a 9 x 5 arrangement, with five columns of nine rounds. The extraction system is based on the never made LMG11 system. Designer Karl Erns used this as the method to operate a high capacity weapon with the small size of a carbine. In fact, the HK78UK is only slightly smaller than the FN P90. This is fed into a recoil operated, rotating breach system that aligns the round to the chamber of the weapon, using a small flap. The firing pin used to fire the round is right behind it, thus eliminating the rod needed to absorb the recoil, allowing the weapon to be smaller. With this design, this is able to provide an impressive 500 rpm capability. The receiver itself is below the barrel, right after the chamber. Thus producing a weapon with good all around firepower and large ammunition capacity, yet staying compact.

Clip design

A small port allows the stock to function normally. Ejection of jammed rounds is accomplished only on the right side of the weapon. The weapon is extremely compact, both in design and function, as it uses a ceramic frame to reduce the weight of the weapon. It features an adjustable stock that mounts an autostabilization system, and a shock pad system. It is considered to be a "bullpup" configuration, again giving credit to the ingenious design of the weapon. To add to this superb suite of recoil reducing measures is the mounted Imp. Gas-Vent II system, offering recoil suppresion unmatched today. The selector switch is the standard "0-1-3-30" configuration.

Additionally, Heckler & Koch offers a suppressed version of the HK78UK, the HK78UKSD. It is functionally similar to the standard HK78UK, removing the Gas-Vent II for a sound suppressor. They also offer clip holders using the TAG FireForce II system, with a specialized holder that holds two clips. Dissasembling the weapon for cleaning is also easy, with the weapon designed to be. The Rotating Breech system, despite it's complexity, is also easy to clean. A maintenance kit is installed in the butt of the rifle that has the proper tools to clean it. Additional kits cost 50¥ and weigh .2 kilgrams (weight for the weapon includes this).

	Type	Conceal	Ammo	Mode	Damage	Weight	Availability	Cost	Street Index
HK78UK	SMG	5(4)*	45(c)	SA/BF/FA	6M	3.9	6/48 hrs	4,105¥	2
HK78UKSD	SMG	4(3)*	45(c)	SA/BF/FA	6M	3.55	6/48 hrs	4,605¥	2

*decrease Concealability to 4 when stock is extended.

The weapon mounts an autostabilization stock, offering 1 pt of recoil compensation, with a Level 1 Shock pad on the folding stock. It also features an Imp. Gas-Vent II system that offers 3 points of recoil compensation. The weapon can mount top-mounted, and under-barrel mounted accessories. The HK77UKSD has no Gas-Vent II system.

TAG FireForce II ammunition pouch.

Designed for the FireForce II, this pouch holds two clips, easily accessible by the wearer, and is adjustable for a comfortable fit.

Type	Cost	Points	Notes
HK77UK Ammo Pouch	20¥	3	Holds two clips

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