with a vast fire arms knowledge i have never heard of a garand light 50,
also gino i think it mite be designed to portray an e.o.d unit, possibly special forces or even just weapon testing and sight aligning in base mabye??? i do have a picture of an e.o.d opperator without armour or helmet,
p.s could they be pmc's hence the little military affiliation provided,mabye the gun is even a little known civilian copy of the barret or if it is a special forces team then mabye it is a new highly accurised varient still in the classified trials????