Running with handstop attachment covers too much of your screen
The handstop attachment (the version that allows the player to shoot while running) changes your running animation
On some guns it covers up too much of your screen AND it it covers the the spot where your crosshairs are aiming.
The main offender I found is the the carbine GTR-BC, and to some degree the SOR-300SC (I could live with this running animation but when you compare it to the MP7, it comes up short)
The golden standard is the PW7A2 (a.k.a. the MP7) when you run this barely covers up any part of your screen
I attached some screenshots and video showcasing the running how much the running animation blocks your screen
Just to add to this, the CCO 2x scope, the OSA-7 1x and ironsights make it more acceptable but even sights like the Mini Flex 1.x cover up much of the screen
GTR-BC:
SOR300-SC:
PW7A2 (MP7):
UMG40 (MP40):