[The KG9 Kid]

Heresy.

[Vigilant1]

XM-307 25mm airbursting auto grenade launcher:

http://www.gdatp.com/products/lethality/xm307/xm307.htm

http://www.globalsecurity.org/military/systems/ground/m307.htm

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XM-312 .50 BMG Heavy Machine Gun:

http://www.gdatp.com/products/lethality/xm312/xm312.htm

http://www.globalsecurity.org/military/systems/ground/m312.htm