They should be hiring you as a 7 but sometimes they do the 5 to save money. I hired on as a 7 Customs Inspector but then for like a year and a half after me they only hired people as 5's. They saved money by getting the employees for that first year as a 5 rather than a 7 and they were basically telling people if you don't like it don't take the job... It isn't fair but that's the crap they do. I agree with Piggy, fight for what you deserve and bring it up at the interview and see if maybe it's just an oversight. If you have a good resume and they want you they'll pay for you. Even as a 5 it isn't so bad, it just takes you four years to make Journeyman GS-11 instead of 4. You will only be there for a year so it's not permanent. It just depends on how bad you want the job. And let me tell you, being a CBPO/Customs Inspector for the last 10 years this job makes Jack Bauer look like a panzy... You'll do so much high speed undercover anti and counter terrorism activities that you won't mind being a GS-5 for one year....
BBBAAAWWWWHAHAHAHAHAHA>...... I couldn't resist!
I am a Paladin, like the warriors of old, ready to stand on the line to keep others safe... A Sheep Dog, ready to protect the herd from advancing wolves!