Officers recovered a haul of weapons after being called to a property in Retford.
Three pistols, a machete and a crossbow were seized by officers and a 52-year-old man was arrested on suspicion of possession of an imitation firearm.
The pistols are believed to be an air pistol, a BB gun and a blank firing gun.
The enquiry took place in Woodside at 12.43am today (Saturday 4 April).
