https://www.nexusmods.com/fallout4/mods/87551
From the mod description:
"You may have noticed that weapons sometimes blink in some weird places during their raise animation after equipping them. If you watch what in happens in slow motion, the weapons are actually coming from all over the place. Sometimes below you, other times above, and some even behind your head! Note that this only happens when you already have something else equipped before opening the pipboy.
when in power armor and in first person, at almost all times, the game slightly reduces your FOV (so it creates a very small zoom-in effect). However, when you open your pipboy, that fov change is reverted. Finally, when you close the pipboy, after a brief moment the FOV decrease returns, creating a slightly jarring visual moment."
mod has closed permissions, fixes would need to be recreated or author contacted.
meshes in question:
📁 Meshes
📁 Actors
📁 Character
📁 _1stPerson
📁 Behaviors
📄 GunBehavior.hkx (280.1 kB)
📁 Meshes
📁 Actors
📁 Character
📁 _1stPerson
📁 Behaviors
📄 MeleeBehavior.hkx (103.7 kB)
📁 Meshes
📁 Actors
📁 PowerArmor
📁 _1stPerson
📁 Animations
📄 MTIdlePowerArmorAdd.hkx (6.4 kB)
Issue Data
Issue #37045: weapon position and FOV twitching when closing the PipBoy