{{Hebiquote
|quotetext=The promise behind this weapon is as follows: A 7.62 NATO machine gun, but [[Heckler & Koch MP5A3|MP5]]-sized. The HK51-B is exactly that, and it is every bit as enjoyable as it sounds - if you enjoy the thought of a short-barreled, fully-automatic 7.62 NATO machine gun thumping against your shoulder, that is. When shooting this thing, it will spit muzzle blasts so big, you'll have your eyebrows singed, and it will be louder than nearly any other weapon in your general vicinity. Is it powerful? Well, with a an 8.9 inch barrel, sacrifices have to be made. Is it short and relatively lightweight? Oh, you bet.
|quoteauthor=Tempest
}}
* Bring a [[G3A3]] and a [[HK21]], both of which will be used for conversion into this weapon
Upon completing the requirements listed above, the HK51 will become available for sale at the Calfair Sector workshop from the Proving Grounds engineer, for [[File:Parallar symbol.png|10px]]'''700'''. For this reason, this weapon is '''Rarity 7 (Unique)'''. Upon successfully converting a G3 and a an HK21 into a an HK51B, it will be loaded with the belt the HK21 was loaded with.
Please note that the Proving Grounds engineer is only available during the day shift (between 8 AM and 8 PM).
[[Category:Class 1 weapons]]