Armed police were called to the Calderdale town after a member of the public reported seeing a man with a gun.
Officers located a car at the junction of Town Hall Street and Tower Hill at about 10.10pm on Friday, May 24.
Inside they found a rifle.
Police helicopters also attended the scene to help find the suspects.
NPAS Carr Gate said on Twitter: "Tonight we have assisted West Yorks Police at Sowerby Bridge, Denholme and Normanton, resulting in 6 persons detained and two vehicles recovered."
Five men aged between 22 and 36 were arrested at the scene by officers for possession of a firearm.
A 29-year-old man was also arrested for possession of Class A drugs.
Police enquiries are ongoing.
Anyone who witnessed anything or has any further information is asked to contact Calderdale CID via 101 quoting crime reference number 13190265160.