This looks like the same replica MG-34 that my DLT-19 is based one, it's a nice and easy conversion to do, and the weight isn't too bad. You just need to be aware that it could damage your armour/children's heads if you're not careful when carrying it!
edit: Just realised that the gun in your picture does not have the bi-pod, you'd need to find one if you wanted screen-accuracy...