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The Franklin Armory FAI-15 is a stripped lower receiver built for folks who want to start their AR-15 build on the right footing. It's forged from 7075-T6 aluminum, which is the stronger, tougher route compared to billet or cast options, and it's wrapped in a hardcoat Type III black anodized finish that shrugs off wear and corrosion after countless range days. Right out of the packaging you'll notice the clean binary mode engraving, a nod to the fact that this receiver is set up to pair beautifully with Franklin's own BFSIII trigger, though it happily accepts standard mil-spec AR-15 fire control parts too.
The headline feature here is the specialized tension screw. If you've ever built an AR and cursed at the play between your upper and lower halves, this little touch solves that gripe. Snug it down and the two halves lock together for a tighter, more consistent feel, no shims or tape tricks required. That kind of detail is what separates a thoughtfully made receiver from a bargain-bin blank.
Because it's a stripped lower, you're free to spec the whole thing to your taste. Drop in your preferred trigger group, grip, buffer setup, and lower parts kit, then mate it to any compatible upper. It's a multi-caliber receiver at heart, so whether you're putting together a lightweight 5.56 carbine or something a bit more purpose-built, the FAI-15 gives you a flexible starting point that plays nice with the huge world of aftermarket AR-15 components.
Forged construction means this lower has the strength to keep up with faster-cycling triggers and years of hard use. The anodized coating keeps the look sharp and professional while doing the real work of protecting the aluminum underneath. For anyone who takes their build seriously, the FAI-15 hits that sweet spot of quality machining, smart features, and a price that leaves room in the budget for the rest of your parts.
The tension screw is Franklin Armory's fix for the play that can show up between an upper and lower receiver. Once you tighten it down, it draws the two halves together for a snug, wobble-free fit. It means a more solid feel behind the trigger and more consistent performance, all without needing shims or aftermarket wedges.
Yes. The FAI-15 is machined to work with standard mil-spec AR-15 components, so your favorite trigger group, grip, buffer tube setup, and lower parts kit will drop right in. It's a multi-caliber receiver, giving you plenty of freedom in how you spec the rest of the build.
The receiver carries binary mode engraving because it's designed to pair perfectly with Franklin Armory's BFSIII binary trigger. That said, the marking doesn't lock you in. You can still build it as a standard semi-auto with any compatible fire control group if a binary trigger isn't part of your plan.
It's forged from 7075-T6 aluminum, which is the same strong alloy used in most quality AR receivers. Forging gives the metal a tighter grain structure and added strength, making it well suited to handle the demands of faster-cycling triggers and long-term use.
| UPC | 818725010835 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 00-20001-BLK |
| Action | |
| ATF Type | RECEIVER |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 9.3500 |
| Package Height | 2.5 |
| Package Width | 5.5 |
| Product Type | Accessory-Lowers |
| Shipping Weight | 0.75 |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| Safety | No |
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