Lucky was shot dead August 7 by assailants who came in car, bearing the registration number of Haryana.
"The main accused, Hemant alias Cheeku, has been arrested by police in Gurgaon. He was also wanted by the Haryana and Delhi Police in connection with several cases," Solan SP Mohit Chawla said.
Three live cartridge and one country-made pistol were recovered from his possession along with a SUV which was looted from someone at gunpoint, he said.
Following a tip off that Hemant had snatched a car at gunpoint, the police traced him and arrested him, Chawla said.
A member of Tillu gang, Hemant was allegedly involved in the killing of two members of Gogi gang besides Lucky, the SP added.
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