Nice build, i do like Tamiyas 1:16 models.
I am a former MG-gunner in the Danish army, an is quite familiar with the MG42 (or m62 as it is know in the Danish Army in 7.62). Its a heavy piece of metal, about 12.5 kg. unloaded, so i think the position of the strap i physically impossible without dropping the weapon.
Also, the weight would make the carrier compensate and lean to the right to balance it. Beside that the strap should be depressed deeper ind the shoulder to illustrate the weight.
I think you ought to replace the strap with some leadfoil and redo his shoulder so the strap looks "sunken in"
Its a nice paintjob, og the face is very nice.