The Preventing Pretrial Gun Purchases Act requires that federal, state, tribal, and local courts include firearm restrictions in pretrial release orders, and mandates that this information be entered into the national background check system to prevent prohibited individuals from purchasing guns. The bill defines "pretrial release orders" and adds them as a category of disqualifying conditions for firearm purchases, alongside existing prohibitions. It also authorizes $25 million per year from 2024 through 2028 in grants to states and Indian tribes to help them report pretrial firearm restrictions to the national instant criminal background check system. The legislation affects firearms dealers, law enforcement agencies, and anyone subject to a pretrial release order that prohibits gun possession, as well as state and local court systems that must ensure such orders are properly reported.