This entity is obsolete; its use is discouraged and it may only exist/function in older engine branches.
func_bulletshield is a brush entity available in the Half-Life 2 series. This is an unused entity that seems to have been specifically for blocking bullets. Use something like
func_brush or the
tools/toolsblockbullets texture instead. To use it, the entity code must be re-enabled.
In code, it is represented by class
CFuncBulletShield, defined in