Gun 3 can be literally the Gewehr 88 S, Gewehr 88/05, Gewehr 88/14 and most Gewehr 98 derivative (e.g. K98a, K98b, Standardmodell, Type 24), so both the Karabiner 98k and the Gewehr 98 answered by CamaroKidBB are correct answers. (Technically, so are the VG-1, VG-2, and VK-98.) Therefore, while CamaroKidBB made two guesses at once, both guesses are correct, so he should receive one point instead of a half point, because 0.5*2=1.
VG-1: https://www.forgottenweapons.com/volksgewehr-vg1/, https://www.youtube.com/watch?v=P-L9gjpdIuI
VG-2: https://www.youtube.com/watch?v=0NspqeRzgH4
VK-98: https://www.youtube.com/watch?v=A7S3IWyjQKY