It looks like the rifle was made by someone who doesn't understand human proportions - the grip is as big as a computer keyboard, the magazine is probably bigger than Yoko's actual body, and the huge stock makes the gun impossible to actually shoulder.
The rest of the costume looks fine, it's a shame the prop isn't.
My friendwas basedon the proportionsthat existon the Internetby multiplying them bymy height(Yokoishigh22.214.171.124XDI'mhigh). In any case,some of the wordsI did notunderstandyour commentbut ifyou meanto say that theriflecarried on the shoulderyou're wrong.The rifleisgrounded toshoot^ O ^
Basing the proportions of the rifle on a poseable figure is not a good idea. In screenshots of the anime itself + official arts you can see that the overall size of the rifle isn't as big as it is on your prop, and specifically the parts of the rifle that are extremely large on yours (the stock, the grip, the magazine).
Rifles are pressed up against the shoulder to shoot. In your case that is impossible or very awkward at best because of the size of the rifle. It is improperly sized to do anything other than hold it like you are in the photo.