Four shotguns were stolen in a farm attack that saw in the ankle and leg.
Thugs stormed a home near Aughton last night, shooting their victim and raiding a collection of legally owned firearms.
Jewellery, cash and watches were also taken in the robbery.
Detectives are now hunting for members of the gang, who entered the West Lancashire property on Sunday night.
The group had their faces covered, potentially with balaclavas, .
Detective Inspector Jason Richardson, of Lancashire Police, said: “We are investigating after a man suffered serious injuries following an armed robbery at a farm in Aughton.
“The victim has understandably been left very shaken by his ordeal and is awaiting surgery at hospital.
and I would like to reassure the public we have a dedicated team of officers working on this investigation."
Armed police were scrambled to Aughton , near Ormskirk, following reports of the shooting at 9.40pm.
No arrests have been made and enquiries are ongoing to find the men involved.
Private gun collections are sometimes targeted by criminals intent on stealing guns to use on the streets or sell to other thugs.
Thousands of legally-owned guns, typically shotguns, are registered with the authorities across Merseyside and West Lancashire.
Both Merseyside and Lancashire Police are currently taking part in a gun surrender , in which owners can hand over weapons they no longer want or feel comfortable storing.
Det Insp Richardson added: "We are determined to find the men responsible and the firearms they took. Patrols have also been stepped up in the area.
“If you know anything about this robbery, I would urge you to get in contact with us at your earliest opportunity. If you saw or heard anyone acting suspiciously in the area around the time of robbery, please come forward.”
*Anyone with information about the incident or the location of the men involved is asked to call Lancashire Police immediately on 999, quoting incident reference 1553 of July 28. They could also contact independent charity Crimestoppers, anonymously, on 0800 555 111 or online at crimestoppers-uk.org.
