A running log of meaningful updates to AR15.BUILD (Staging). We ship when something is genuinely
useful, not on a schedule.
Build tool improvements
Latest
Bundle item override — got a complete lower but want a
different trigger? You can now replace any individual item included in a bundle with a component
of your choice. The build reflects both the bundle and your override.
Each selected component in your build now has a direct link to its product page, so you
can pull up specs, pricing, and reviews without leaving your build.
Sort by popularity and rating
Product list pages now support sorting by popularity — ranked by how many public builds include each component — and by rating.
Sort order (ascending or descending) can be toggled independently of the sort field.
Richer compatibility data
We're expanding the dimensional data we capture across component types. This data isn't
yet wired into the compatibility checker, but it lays the groundwork for more precise
fitment checks in the future.
Gas blocks now capture bore diameter — the critical spec for matching to your barrel's
journal diameter.
Scopes and magnifiers now capture tube diameter (1", 30mm, 34mm, 35mm) and optic mounts
capture their ring bore diameter.
Barrel gas block journal diameter is now explicitly extracted rather than inferred,
completing the barrel → gas block data chain.
Buffer tubes and stocks/braces now capture their respective outer and inner diameters,
covering mil-spec vs commercial fitment.
Mobile browsing improvements
Product list pages now show a clean card layout on phones — no more horizontal scrolling
through a wide table.
Build hero images and pagination fixed across all public build pages.
Price alerts
Set a target price on any component and get notified when it drops below your threshold.
Alerts are managed from your account and work across all tracked component types.
Inventory tracking
Components now track in-stock and out-of-stock status based on merchant data, so you can
see at a glance what's available.
Brand pages & global search
Every manufacturer now has a dedicated page listing all of their components in the
catalog.
Global search now returns products, brands, builds, and guides from a single search bar.
Improved SEO and internal linking across product and brand pages.
Improved product filtering
Product list pages now support filtering by material, caliber, barrel length, and
rating.
Sort by name, price, or manufacturer — in either direction.
Active filters are preserved in the URL so you can share or bookmark a filtered view.
Pagination added to product lists to handle large catalogs efficiently.
Guides & articles
A new guides section covers build planning fundamentals, left-handed AR-15
considerations, and more.
Guides are linked from relevant product and tool pages to surface them in context.
Planning tools
Muzzle velocity estimator — estimate velocity based on
barrel length and caliber.