PHILADELPHIA — Pennsylvania Commonwealth Court voted 4-3 last week to uphold Philadelphia’s ordinance prohibiting the manufacturing and assembling of 3D-printed gun parts used to create “ghost guns.” The majority decision of the appellate court filed Friday said that Philadelphia’s ordinance, as amended in January 2021, did not violate the state constitution’s gun-ownership protections and a 1996 Pennsylvania Supreme Court ruling that state lawmakers have sole authority over firearm laws, meaning that local jurisdictions, such as Philadelphia, cannot pass their own contradicting laws. The chal…