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<Half-Life 2> 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 func_bulletshield.cpp.