Below you will find "upgrade trees" presenting available upgrades and relevant information/advice for specific firearms (for example, did you know there are four different ways to install a stock on a Saiga?). We are always adding new firearms, so check back often.
For popular weapons, only a representative slice of the market will be shown. The market is simply too vast to even consider maintaining a complete list of parts available for, say, an AR-15 build. Instead, the goal is to provide a prospective buyer with a good idea of "what's out there" so they can plan their build project.
For more niche weapons, an effort will be made to list all parts and mods available.