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func_bulletshield
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This entity is Obsolete.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 
Half-Life 2, 
Half-Life 2: Episode One, 
Half-Life 2: Episode Two, and 
Half-Life 2: Deathmatch. 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 theCFuncBulletShieldclass, defined in thefunc_bulletshield.cppfile.