Bhai Takht Malh ji was son of Bhai Dharam Das ji, who was from Gujarat (Pakistan). And, Bhai Dharam Das ji was blessed with Sikhi from the Sixth Guru of Sikhs. The weapons which was used by the sixth guru in the wars that all are made by the iron smith and his name was Bhai Bakht Malh, who was a Muslim.
When the army of Mughal empire knew about him, they forcefully hired him. They offer some money to him and because of his greediness he cheated his work profession. After that he made bad quality weapons for Sikh soldiers. The result of this was, when Sikh soldiers used that weapons in the war, weapons broke while using. If they used the sword, the sword was broken and if they use shield to stop the attack of their opponent soldiers then the shield was also broken.
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Akal Takht Sahib was situated by Shri Guru Hargobind Sahib Ji.
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