system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout 4] I used to live in the Capitol Wasteland and had to run regular maintenance on my gun. Now I live in the Commonwealth and the gun never breaks. What gives?
gpt
One of the first things the Institute created were maintenance nanites. They can repair minor damage at a molecular level, keeping things running longer without the need to tedious maintenance. But, they aren't self replicating, and if something suffers too much damage, they 'write it off' and focus on something else.

*Non-canon. The more realistic answer would be, you still have to preform semi-regular maintenance on a firearm. But the system previously used required WAAAAAAY too much maintenance, and doing it realistically wouldn't really add anything to gameplay (you clean your handgun every day. It works fine for 20 years without so much as a missfire) so it's just assumed you do it and its in the background.