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In most states, the use of a gun to rob a gas station would be considered aggravated robbery. Do you have a specific state in mind since each state will have different sentencing guidelines?
In Canada, the minimum sentence would be 5 years for the first offense and the maximum penalty could be life imprisonment. When determining on the range of possibilities of the actual sentence, the courts will consider the following factors:
The case law, however, has deviated slightly from this statutory minimum. Usually the starting point in cases is around 3 years, and the sentence adjusts upward or downwards based on the above factors. If you want a list of sentences of recent cases in Canada for armed robbery, you can find a list of cases at the following link: https://en.wikibooks.org/wiki/Canadian_Criminal_Sentencing/Cases/Robbery#Store_Robberies
In terms of the length of probation, it will really depend on what the sentencing judge decides; however, the maximum length of the probation will be 3 years. I hope this has been helpful...if so, please provide positive feedback!