Foundations
Start here for the baseline knowledge behind the rest of PBU. This hub covers firearm basics, terminology, ammunition fundamentals, AR platform concepts, safety, and the core ideas readers need before diving into components, systems, ballistics, or troubleshooting.
Go To HubOwnership & Legal
Practical education for responsible firearm ownership, including safe possession, transfers, prohibited configurations, NFA items, constructive possession, transport, shipping, storage, and the legal concepts builders and owners should understand before buying or modifying firearms.
Go To HubComponents
Deep dives into the physical parts and assemblies that make up the AR platform. This hub explains how each component works, what design variables matter, how parts interface with one another, and how component choices affect reliability, durability, handling, and performance.
Go To HubSystems
System-level explanations of how multiple components work together. This hub covers the operating cycle, gas system, locking and unlocking, buffering, feeding, extraction, ejection, fire control, suppression effects, recoil behavior, and tuning relationships across the rifle.
Go To HubMaterials & Finishes
Explore the materials, heat treatments, coatings, and surface finishes used across AR components. This hub explains how material selection, hardness, case depth, corrosion resistance, wear behavior, lubricity, and manufacturing processes affect durability, reliability, service life, and component performance.
Go To HubSpecs, Inspection, & Quality
A technical reference for understanding specifications, tolerances, inspection methods, and quality indicators across AR components. This hub covers dimensional checks, material verification, finish evaluation, wear inspection, acceptance criteria, common defects, and what actually matters when judging component quality.
Go To HubBallistics
COMING SOON!
Click-Bang-Ding. The journey from the chamber to target is a fast one. You have probably never actually seen what happens between the click and the ding. Everything that happens to a bullet from the moment you pull the trigger to the moment the bullet stops moving can be summed up in one word: ballistics.
This series of articles is so substantial, that it is it’s own college within PBU. We will do our best to explain everything you need to know about the journey of a bullet.
Coming Soon