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About the title, it's some sort of Chinese net slang for describe CQC door breaching activity. The most poplular explanation of this phrase refers to Chinese police or PAP (People's Armed Police) sometimes tempt criminal open door in excuse of check water meter, community survey and express sign.

Addons courtesy of Alwarren's FHQ M4 pack , Cunico's Hidden Identity Pack V2 and massi's USSOCOM 75th Ranger, Navy SEALs DEVGRU and Delta Force ."