Forged Fire/Safe Marked 80% Lower Assembly – Your Build, Complete.
You’re looking at the core of your next AR-15. This isn’t just a box of parts; it’s the complete foundation. We put this kit together because you need a solid start, without hunting down six different pieces. Here it is: a forged 80% lower, a full lower parts kit, a butt stock, and the buffer tube assembly. Everything from the trigger to the shoulder pad. Buy this, get your jig and tools ready, and you’re most of the way there.
The Heart of the Kit: The Forged 80% Lower
This is where we don’t cut corners. It’s forged 7075-T6 aluminum, the same spec as issued military lowers. That means it can take a beating. It’s not cast; it’s forged for density and strength. The magwell is broached clean – magazines drop free every time, no sticking. The anodized Mil-Spec black finish is hard and resistant. And it’s marked where it counts: clean, deep FIRE and SAFE engravings on the selector side. It’s a professional mark, not an afterthought.
This is 100% made in the USA. From the forging to the final engraving. We support the shops and machinists here, and you should too.
The critical detail: This is an 80% lower receiver. It is not a firearm. It requires machining to complete. By federal law, NO FFL IS REQUIRED for purchase, and it can be shipped directly to your door in most states. (You are responsible for knowing and complying with all state and local laws.)
What Else Is In The Box? No Guesswork.
We hate kits that leave you hanging. This one doesn’t.
- Complete Lower Parts Kit (LPK): All the springs, pins, and fire control components you need to make the lower functional. Includes trigger, hammer, disconnector, safety selector, magazine catch, bolt catch, and all associated hardware. Quality commercial-grade parts that fit and function.
- Buffer Tube Assembly (Mil-Spec Diameter): Includes the buffer tube, buffer spring, and buffer weight. This is a carbine-length system, the standard for most AR-15 builds. Threads are clean, and it’s ready for your stock.
- Butt Stock: A standard 6-position adjustable carbine stock. It locks up tight on the tube, has a decent cheek weld, and does the job. It’s a practical starting point – you can always upgrade later, but this gets you running.
With this assembly and an upper receiver group, you have a nearly complete rifle. The value is in the bundle. Sourcing these separately costs more in shipping and time.
Who This Is For (And Who It Isn’t)
This kit is for the builder who understands the process. You know what a drill press or router jig is for. You take pride in building your own equipment and understanding every component. It’s for the marksman who wants a rifle without a serial number, built to their own standards. It’s for the patriot who values self-reliance.
This is not a pre-built firearm. It is not for someone unwilling to perform the final machining operation. That operation is your responsibility. If you’re new to 80% builds, research is required. Understand the tools, the process, and the law. It’s a rewarding project, but it demands attention to detail.
Straight Specs:
| Component | Details |
|---|---|
| 80% Lower Receiver | Forged 7075-T6 Aluminum, Anodized Black, FIRE/SAFE Engraved, Broached Magwell, Made in USA |
| Lower Parts Kit | Complete Fire Control Group, Selector, Takedown Pins, Bolt Catch, Magazine Catch, etc. |
| Buffer Tube Assembly | Carbine Length, Mil-Spec Diameter, Includes Buffer & Spring |
| Butt Stock | 6-Position Adjustable, Mil-Spec Compatible |
| Legal Status | 80% Frame – NOT A FIREARM. No FFL required for purchase. Subject to state/local laws. |
| Price | $131.99 for the complete assembly. |
Bottom Line from Polymer80Hub
We sell this because it’s the kit we’d want. A tough, forged lower at the center, paired with all the essential parts to make it a working assembly. It’s straightforward, American-made, and delivers real value. If you’re ready to build, this is the most sensible place to start. Get your tools, clear your workbench, and let’s get building.
Note: Check your state and local regulations regarding the purchase and completion of 80% receivers before ordering. It is the customer’s responsibility to ensure compliance.
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