These Are The Photos Of My Gun Stretching when i look down up and just looking forward.
Hi! I don’t think there are any psychics in this forum 
(just joking). We’d need to at least know how you’ve setup the camera and the gun to be of any help, how is anyone supposed to know what’s wrong just from the screenshots? It could be literally anything.
Since you’ve posted in the physics forum, I’d guess you’re using a rigidbody for your gun and picking it up/attaching it to the camera using joints, or something similar?