The man who police said opened fire at a Molson Coors plant in Milwaukee this week — killing five co-workers and himself — was a gun-obsessed electrician who built his own firearms, according to a report.

Anthony Ferrill — who authorities said unleashed one of the worst mass shootings in Wisconsin history on Wednesday — built guns with mail-order parts as a hobby, his next-door neighbor Erna Roenspies told journaltimes.com.

The 51-year-old disgruntled Coors employee had worked in the plant for 15 years before slipping off a ladder and hurting his shoulder, forcing him to miss work, said Roenspies, 82.

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