The Forensic Laboratory Division of the Allegheny County Medical Examiner's Office has a position for a Firearms and Toolmark Examiner/Trainee opening up. 

For the job description/requirements,
http://www.alleghenycounty.us/jobs/scientist.aspx (http://www.alleghenycounty.us/jobs/scientist.aspx)

The application can be found at:
http://www.alleghenycounty.us/jobs/dearapp.aspx (http://www.alleghenycounty.us/jobs/dearapp.aspx)