Well, it's hard to say for sure. Release dates can change, but usually, you can find out by checking the publisher's website or relevant literary news sources.
The FNAF novels tend to tie in with the games when they expand on the game's mysteries or provide deeper insights into the characters and settings. It could be in the form of prequels or sequels that complement the game's narrative.
The flintlock was first invented during the Southern Song Dynasty in China. In 1132 AD, the military strategist of the Southern Song Dynasty invented a kind of tube-shaped firearm called the musket. It could be called the ancestor of modern tube-shaped firearms. In 1259, the Shouchun people created a type of gun, which was the real origin of modern shotguns. Therefore, the musket was first made between 1132 and 1259.