Pahar Singh, 48, was arrested from his residence in Uttar Pradesh's Meerut on charges of supplying a home-made weapon to main accused Hardeep Singh.
"During investigators, it revealed that Hardeep visited Meerut on three occasions during 2016 and 2017 to procure weapons to carry out the target killings of members of the RSS and other organisations," an NIA statement said.
It also said that "Hardeep, in April-May this year, procured a .315 bore country made weapon from Pahar at his residence.
"This weapon was recovered and seized at the instance of Hardeep, subsequent to his arrest by Punjab Police in November."
The statement also said that Pahar Singh was accused in an arms act case registered in Uttar Pradesh's Amroha district in September. He will be presented before a special NIA court in Mohali on Wednesday, an official said.
The NIA, which took over the case from Punjab Police following a November 16 order by the Home Ministry, also carried out searches at a hotel in Meerut and seized its guest register as part of its probe in the case that is the latest in a series of murderous attacks on right-wing and religious leaders in Punjab.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)