Independent upper receiver guides for smarter AR-15 builds.
AR15 Uppers is an independent editorial resource for understanding complete uppers, receivers, barrels, rails, BCGs, charging handles, and upper-to-lower compatibility before you build or upgrade.
Start with the main upper categories.
Each hub is built for educational content first, then sends qualified readers to the relevant AR15Parts category when they are ready to compare parts.
Complete Uppers
Guides for choosing complete AR-15 uppers by barrel length, intended use, gas system, and included parts.
Topic hubUpper Receivers
Explainers covering stripped uppers, assembled uppers, receiver materials, fitment, and compatibility.
Topic hubBarrels
Educational resources for AR-15 barrel length, twist rate, profiles, gas length, and caliber choices.
Topic hubHandguards
Practical guides for free-float rails, drop-in handguards, M-LOK, KeyMod, length, and mounting choices.
Topic hubBCGs & Charging Handles
Compatibility and buying guides for bolt carrier groups, charging handles, coatings, and ambi controls.
Topic hubCompatibility
Fitment explainers for upper and lower compatibility, gas systems, calibers, parts matching, and upgrades.
Parts resource
Ready to compare AR-15 parts?
Use the guide above to narrow your parts list, then browse AR15Parts.com for upper receivers, barrels, handguards, BCGs, charging handles, and build components.
Launch-ready starter content.
These drafts establish the article model, internal-linking pattern, and CTA style. We can replace or expand them with final researched content.
CompatibilityAR-15 Upper Parts Names and What They Do
A plain-English breakdown of common AR-15 upper parts, including barrels, handguards, BCGs, charging handles, and gas system components.
Complete UppersComplete AR-15 Upper With BCG and Charging Handle
Learn what is usually included with a complete AR-15 upper that comes with a BCG and charging handle, plus what buyers should verify.
Upper ReceiversWhat Is an AR-15 Upper Receiver?
Learn what an AR-15 upper receiver includes, how it connects to the lower, and which parts matter when planning an upper build.