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Building an AR15 lower comes down to a handful of small metal parts doing their jobs perfectly, and this is where the White Label Armory Stage 4 kit earns its spot on the bench. It's a phosphate-finished set of mil-spec internals covering the fire control group, catches, pins, and springs, minus the trigger guard and grip so you can finish the build your way. White Label Armory keeps everything sourced in the USA, with no foreign, polymer, or MIM parts making their way into the kit.
The kit brings a hammer, trigger, and disconnect for the fire control group, along with the safety selector and its detent and spring. You also get the magazine catch assembly, bolt catch, front and rear takedown pins, and a full spring set to round out the internals. It's precision-machined to mil-spec dimensions, so it drops into any standard mil-spec lower without fuss. What you won't find in the box is a trigger guard or a pistol grip, which is by design for builders who already have their favorites picked out.
That black phosphate coating isn't just for looks. It fights corrosion on the small parts that see the most friction, and the surface quality has a lot to do with how smoothly a takedown pin slides or how positively a safety selector clicks over. On a solid kit like this, that translates to internals that feel right once they're seated in the receiver.
All AR15 lowers use the same lower parts regardless of chambering, so whether you're running 5.56, .223 Wylde, or 300 Blackout, this kit has you covered. If it's your first lower, take your time with the small detents and springs and do a full function check when you're done. Pair it with a stripped receiver and your grip and trigger guard of choice, and you've got the foundation for a clean, reliable build.
No, and that's intentional. The Stage 4 kit is built for people who want to run their own grip and trigger guard, so those two pieces are left out. Everything else needed for the lower internals is in the box.
Yes. The parts are machined to mil-spec dimensions and are guaranteed to fit a standard mil-spec lower receiver. You supply the stripped receiver separately, since this is a parts kit and not a complete lower.
For standard AR15 builds it doesn't. A 5.56 NATO, .223 Wylde, and 300 Blackout all use the same lower parts, so this kit works across those chamberings. AR10-pattern rifles use their own larger parts and aren't compatible with this kit.
It's a solid choice thanks to the mil-spec fit and USA-made components. The small detents and springs are the fiddly part of any lower build, so go slow and keep them from launching across the shop. Do a full function check after assembly and you'll be set.
| UPC | 810155160685 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | WLA-LOW-1014-01 |
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