In PlayerUnknown's Battlegrounds there are several different areas that a player can head to to find various different weapons, attachments and items. Each time a new game starts new items are randomly generated throughout the map. So just because you found a certain weapon in a specific house last game, is no guarantee you will find that same weapon in the same spot the next game.
However in the game it is commonly accepted that certain area's, such as the Military Base Island, the School, or Hospital are more likely to have higher quality loot or weapons (More sniper rifles, higher level backpacks/armour ect.). I have yet to be able to find anything that supports the idea that the higher level of gear is a result of the area vs. those areas just have a higher number of spots where loot spawns. For example are you more likely to find higher quality gear in a roadside shed on Military Island than in the same type of shed on the main Island, or is their no difference?
The main question is, is the quality of the weapons, attachments, and gear you find affected by the area that you find it in?
Hopefully there would be some information on loot spawning from the developers, but any information gathered by testing or data-mining would be appropriate as well.