Four men have been charged with firearms offences.
Robert Watts of Honey Hill, Lees, Oldham has been charged with two counts of possession of a prohibited firearm and three counts of sale of a firearm.
Laurence Golesworthy of Castle Street,Hay on Wye,Powys has been charged with two counts of possession of a prohibited weapon.
Carlo Cavey born of Blackburn Way, Godalming,Surrey has been charged with six counts of possession of a prohibited weapon and one count of possession of ammunition without a certificate.
Matthew Ashton of Formby Road, Salford has been charged with possession of class A drugs (Cocaine) with intent to supply, possession of class A drugs (Methylamphetamine), three counts of possession of a prohibited weapon and possession of criminal property.
All four men are due to appear at Oldham Magistrates court on the 29 May 2014.
The charges relate to an operation into the selling of convertible firearms over the internet.