§ 9712, of the Pennsylvania Crimes Code provides for a mandatory 5-10 year sentence for a Defendant who uses a firearm in a robbery or aggravated assault.   However, the Pennsylvania Supreme Court has found that this statute has also been subject to some extremely narrow readings. In Commonwealth v. Foster, the defendant was an accomplice in an armed robbery and did not actually possess the automatic weapon that had been used to force the victim to withdraw money from a bank machine.   The Court refused to impose a 5-10 year mandatory sentence on an unarmed co-conspirator in a robbery case and said that a 5-10 year mandatory sentence should only be imposed on the possessor of the firearm