Q: I had four chargers and plead out to a simple assault. I got a 100$ fine and court costs all of which were paid in full and finished probation early.

A: If the Simple Assault was graded as a Misdemeanor 2 or higher (M1, F3, F2, F1, etc.), and you pleaded guilty to it,  then you will be prohibited under Federal Law from possessing a firearm which will preclude you under the PA Uniform Firearms Act.  If you were convicted of a Mutual Combat Simple Assault which is graded as a M3, you will be OK. You need to order your criminal history to be certain of what you were convicted of.