Four men have been sentenced to a total of 46 years after they claimed to be uniformed police officers before robbing their victims.
Among their crimes was a £30,000 raid on a jewellers in Preston.
Richard Clancy, 27, from Little Hulton, and Matthew Cheston, 31, from Warrington pleaded guilty to conspiracy to rob, conspiracy to kidnap, and burglary.
Connor Smith-Macphee, 20, from Salford, pleaded guilty to conspiracy to rob, conspiracy to burglary, conspiracy to kidnap, possession of a firearm without authority and possession of a prohibited weapon.
Mark Worthington-Breen, 22, from Little Hulton pleaded guilty to conspiracy to rob , conspiracy to kidnap and arson with intent to endanger life.
Clancy was jailed for 13 and a half years, Cheston to 12 years, Smith-Macphee for nine years and Worthington-Breen to 11 and a half years.
They were sentenced on Friday at Manchester Minshull Street Crown Court.
Between March 2012 and April 2012, the gang targeted homes and jewellers purporting to be uniformed police officers in the Greater Manchester, Halifax and Preston areas
The raid in Preston took place at Sohum Jewellers on Meadow Street, Deepdale atlast April.
Two men entered the shop, showed their fake ID and claimed to be investigating a theft.
The owners were then tied to chairs before the shop was ransacked.
The two men then fled with thousands of pounds worth of jewellery and money and made off in a getaway car.