You'd use FO4Edit to change all the recoil values to 0. You'd need to this for all the attachments since each piece has various values associated with it.
thanks for noticing this thats why i always inacurrate when using full upgraded gauss rifle, bless u bro. btw i have request can you look bug that happened when you give shielded gauss rifle to companion, the shield is out of place sorry for my bad english maybe u should try it so u can know what i mean. thanks before
It appears fine in my game. I googled and came across this link, maybe it will help. One person suggested it only happens with dead NPC's weapons, so maybe try spawning a new one, or buy a new one.
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https://forums.nexusmods.com/index.php?/topic/4127305-npc-weapon-glitch-npc-weapons-broken-into-pieces/