I had no idea you could “mod” guns to make them more accurate apart from lightening the trigger pull. Although that doesn’t make them more accurate technically speaking.
Maybe I’ll get a Mosin Nagant to keep me busy until I have my own garage.
PS If you wanna get technical, I guess it’s more like chassis stiffness for guns, but whatever.
TL;DW He pours some magic juice in there that hardens and holds the barrel more securely in place.