Kanta, who along with his associates surrendered without arms yesterday, they said.
Kanta was active in the Maoist-backed Chasi Mulia Adivasi Sangh (CMAS) and involved in extremist activities for the last 12 years, BSF officials said.
The commander later helped a BSF team to retrieve a 12 bore Single Barrel Breach of Loaded (SBBL) gun along with two grenades, they said.
Kanta was the commander of "Ghenua Bahini" and figured in the most wanted list for his involvement in various Maoist activities.
A senior BSF official said the ultras decided to surrender and return to the mainstream as they were disillusioned with the activities of Maoists.
This was the second time in the last fortnight when Maoists surrendered before the BSF.