Christian Hall, 24, was sentenced to two to five years in prison on Monday.
Hall had been convicted of purchasing handguns and AK-47s for criminals in the Olney section, the district attorney said.
The purchases happened between April and August of 2011.
Investigators said Hall falsely identified himself as the purchaser when buying weapons.
One of the weapons was found at the scene of a shooting in Frankford on February 22, 2012.
The rest of the guns remain at large.