Headscratchers / NUMB3RS

• There is a mistake in Season 2 episode "In Plain Sight" where one of the SWAT cops has the magazine of his MP5 inserted backwards. Obviously this should be impossible for a real weapon in working order but how did it occur in filming? The mistake can be seen at the Internet Firearms Database here: http://www.imfdb.org/wiki/Numb3rs#Submachine_Guns

---