According to investigators, the guns were purchased by Kmetz online for $675, and then picked up by Garant.
"You think you do a good job bringing the kid up and then that happens," Ronald told Fox 9.
It was Thursday night that the Garant's home in Golden Valley, which Michael and Ronald live in together, became the center of an investigation.
"About ten cops. They told me to sit in my chair. They said this is not about you, this is about your son," Ronald continued.
Ronald's son, Michael, was arrested, but the charges were later dropped due to a lack of evidence.
However, Ronald says his son admitted to him he did in fact pick up the guns for Kmetz.
"He said it was true. He done it. He bought the guns for him," Ronald said.
According to Ronald his son first met Kmetz after plowing his driveway. The extent of the two's relationship is still unclear, but Ronald says his son did not know about Kmetz's long history of mental illness.
"But why he bought the guns, I have no idea, he hasn't told me, so I have no idea," Ronald said.
Though the charges have been dropped, the Hennepin County Sheriff's Office says the investigation remains far from over.
According to the Sheriff's Office, what Michael did was illegal, but the County Attorney's Office did not agree. Calling the evidence insufficient and saying, "justice required he be released."