Books

Deathlands

For those of you who dont want to visit the wiki article here is the synopsis

On the morning of January 20, 2001 the climax of the Cold War set the post-apocalyptic stage for the series. The end game began with a pre-emptive strike on Washington. Underground nuclear bombs were detonated from within the basement of the Soviet embassy, by an elite group of Spetsnaz operatives, destroying the central command structure and political system of the United States. For an indefinite period of time a nuclear exchange between the United States and the Soviet Union devastated both countries and subsequently the entire planet (but little details are known outside both countries). All manner of genetic contagions were released infecting the survivors of the firestorm with horrible illnesses. The remaining survivors lived harshly during a time of prolonged nuclear winter known as 'Sky Dark'. The geography, climate, and ecosystems of the world had changed dramatically. What was left of the United States came to be known as the Deathlands.

100 years later civilization begins again: brutal, short lived, morally confused and crazed from mutation. Between the many hot spots are small plague pits ruled by power hungry individuals who have no limits in order to establish their rule and expand their influence. These individuals are known as the Barons. Their rabble pits are known as Villes and Baronies. Civilization unknowingly resembles the Dark Ages. Trading resumes between the villes: Jack (a regional currency), Jolt (a hallucinogenic mixture of Mescaline and Heroin) and slaves are the primary forms of currency. Life is a strange mixture of ancient history and limited technology that is scrapped from the 20th century. Military technology is the most prized possession of all; success is often measured by the number of bullets he or she possesses. A man named Ryan Cawdor leads a group of companions across the deathlands. Ryan has extremely secret knowledge of the 20th century. The understanding of hidden underground complexes, known as redoubts, that contains Teleportation technology. He and this companions guard this knowledge with their lives. The technology is called MAT-TRANS.

TL;DR Post apocalypse series of books that has a sci-fi element in it

I think they are up to 107 in the series and Era I am sure if you read it some of the gun stuff would make you cringe while other parts would deserve a slow clap.