A produce derived from G3, Heckler & Koch designed the 7.62 calibre machinegun HK21 in 1961.
This MG fires from a closed bolt, operates on the roller-delayed blowback action mechanism of G3, chambered for 7.62x51mm NATO, able to fire at a rate of 800 rounds per minute cyclic, within a 1200 metres effective range coverage. The ambidextrous fire selector leaver allows HK21 to fire as semi-automatic on top of fully automatic firing, forearm of the weapon can mount a bipod for prone position/wall mounted firing.
The belt feeding module is located beneath the receiver, which means HK21 can be modified/reconfigured to accept either box/drum magazines or to feed from munition belts. HK21 can be fed with 20-/30-round box magazines, 80-round drum magazine or lose/boxed ammo belts in lengths of 50 increments, HK21 can also make use of G3's 7.62 magazines.
Close bolt firing meant the weapon have limited the maximum effective range and sustained firepower capabilities when compared to open bolt design MGs, however it does have a more accurate semi-automatic firing performance, to an extend they function relatively ideal as a squad automatic weapon. But HK21 did not enter full time service with the Bundeswehr, the main service MG contract during the cold war for West Germany was taken by Rheinmetal's MG3.
With HK21 not being chosen as the main service MG, HK soon turn their development focus to export with the HK21 series of LMG, variants such as HK11E, HK21E and HK23E were used in many countries inside and outside of NATO. However the production of roller-delayed blowback MGs gradually slowed down with the trending interest in gas-operated MGs, HK ceased the production of HK21 lines of MG completely by early 2000, the new line of MG developed by HK would be the HK123 (MG4) family.
Character Info
Design
A short petite MG T-doll introduced with the event Singularity. HK21 is around 130cm of body height, she have medium length bleached blonde tighten in twin ponies. HK21 is identified by her cowboy style outfits, her grey tint round glasses and her pink iris.
A small key-ring of G3 can be found attached on HK21's barrel, symbolizing her affection to her sister.
Personality
Official character description: HK21's personality leans towards solitary, to the characters her behaviours are considered slightly disobedient. Due to her sister AR G3G3G3's personality, she is often ignored by her, so HK21 often do things to draw attention from her sister. One example being her hair colour, she had the same colour hair as her sister but she intentionally bleached it to gain some of G3's attention.
As one of the projects branched off the G3 automatic rifle, it is reasonable for HK21 to consider G3 as her sister, HK21 is by all definitions, a sis-con. However nothing was mentioned about the other G3 derivatives though, not even the 5.56 calibre version of HK21, the MG HK23HK23HK23.
In-Game
HK21 have a one of a kind skill, when active she gains additional ammo, firepower and accuracy, she would also switch target after every hit. Though her own movement speed is reduced while the skill is active.
Some players have tested HK21's skill logical process orders, even if HG ContenderContenderContender is present the squadron and have marked a target with her inquisitor's shot, HK21 would still continue to spray other targets instead of focusing on the marked target.
HK21 is able to provide armor bonus to SG units in front of her.
Story Involvement
A T-doll servicing G&K main forces, a side character in the latest event Singularity. Singularity is a series of highly detailed story told by different routes describing a chaotic crossfire conflict between G&K, Sangvis Ferri, SOCOM, Defiance and 404. HK21 only had minor interactions with the Commander's forces during the hidden level of chapter 2: Survivor. The event of Survivor happened somewhere in between 0030 to 0150 hour.
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Singularity
HK21 was among the G&K T-doll units under another G&K service officer's command, she was part of the joint operation with SOCOM in attempt to annihilate Master mind. With the chaotic turn of events of Singularity, she was temporarily assigned under the Commander's forces. She was sent by her sister G3 from the front line to deliver a message to the Commander regarding the situation there.
HK21 thanked the Commander for reuniting her with her sister G3, she then provided updated situation report on the front line to the Commander. G3 and her echelon units are fighting against the Ferri, but however Ferri have a large amount of reinforcement and their supplies are running low. G3 requested the Commander to open up a supply line for the front line fighting units to give them immediate logistical supports and relief some of their pressure, the front they are holding out is crucial in the following operations so retreating is not an option.
At this point another T-doll joined the channel, SMG Honey BadgerHoney BadgerHoney Badger who was scouting in the region reported that Ferri have also engaged in combat with the SOCOM units, to ensure the operation success, the Commander must avoid confronting the SOCOM armor units.
HK21 comments on the situation just gotten more dire, but for the sake of her sister the supply line must be maintained. Honey Badger reminded HK21 to pick her up on the field when the units are passing by.
"As long as G3 sis is safe, the others can do what they want..." - HK21
"Wait, what did you say?" - Badger
"I'm joking. This is an emergency situation after all, we have to work together if we want to survive... Probably..."
After the sightly discouraging speech from HK21, she departed to assist in the establishment of this crucial supply line.
Commander, I really... Just wanted my sister to notice me... I don't know how I got your attention... How cunning... You'll be responsible for taking away part of my love for my older sister!