A senior investigating officer in the case for West Midlands Police said they are disappointed with the length of the sentences.
Detective Inspector Sharon Naughton said they had been expecting longer.
More top news
Police have released CCTV images of a man they want to speak to in connection with an armed robbery in Rednal.
A chilly but bright start to the day, a few sharp showers towards Shropshire.
Some bright and sunny spells, but becoming rather cloudy at times with scattered showers developing.