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This Franklin Armory complete pistol lower arrives fully assembled and tested from the factory, giving you a head start on your AR build without the assembly hassle. The lower sits on a forged 7075-T6 aluminum foundation with a hard coat Type III anodized black finish that stands up to regular use. A specialized tension screw is included to dial out any wiggle between the upper and lower receiver, which makes a real difference in how your finished gun feels and performs.
Not for civilian sales in: CA, CT, DC, DE, FL, HI, IL, MA, MD, NJ, NY, OR, RI, VA, and WA
The real star here is the BFSIII binary trigger, which comes pre-installed and factory-tested. This is a three-position selector: safe, semi-automatic, and binary mode. In binary mode, the trigger fires one round on the pull and another on the release, delivering faster splits between shots than a standard trigger. The straight profile trigger shoe keeps things fast, and the 4.5-pound pull weight is smooth and consistent. If you want that extra speed at the range or for competition, binary mode delivers it without any lower receiver modifications.
The SBM4 pistol stabilizing brace comes installed and is designed to work with AR pistol-style buffer tubes. Made in the USA and veteran designed, it provides that third point of contact that makes the whole platform more stable and easier to shoot accurately. The brace includes an adjustable nylon strap for a customized fit. You also get a single 30-round stainless steel magazine that works with 5.56 NATO, so you can start slinging rounds right away without hunting down compatible mags.
Everything ships ready to go. The tension screw eliminates the play between upper and lower, there’s an ambidextrous sling mount for rigging options, and the lower itself is mil-spec compatible with most AR-15 upper receivers. Whether you’re assembling a compact defensive platform, a range gun, or something in between, this lower gives you the binary trigger advantage without the DIY trigger installation work.
The BFSIII fires one round when you pull the trigger and another when you release it, cutting split times in half compared to standard semi-automatic triggers. It has three positions: safe, semi-auto for one round per pull, and binary mode for the two-round functionality. You stay in full control, and the release round can be canceled by moving the selector out of binary mode while holding the trigger back.
Yes, this Franklin Armory lower is mil-spec and compatible with standard AR-15 uppers in various calibers including 5.56 NATO, .308 Winchester, 300 Blackout, and more. The included tension screw helps eliminate receiver gap and gives you a tight fit with most quality uppers.
The SBM4 comes already installed on this lower, so nothing needs to be done there. It’s a fixed position brace compatible with AR pistol-style buffer tubes and includes an adjustable nylon strap for a custom fit. It’s designed to improve stability and control compared to shooting without a brace.
Yes, this lower accepts standard AR-15 magazines. The included 30-round mag works great, but you can use any mil-spec AR magazine in 5.56 NATO or compatible calibers depending on what upper you pair it with.
You get the complete lower receiver with the BFSIII trigger pre-installed and factory-tested, the SBM4 brace already mounted, one 30-round stainless steel magazine, and the specialized tension screw. Everything ships ready to accept an upper receiver.
Yes, Franklin Armory factory-installs and tests the BFSIII binary trigger before shipping, so you skip the installation work and get a trigger that’s been run through their QC process. This saves time compared to installing a trigger kit yourself.
| UPC | 818725013485 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 00-30043-BLK |
| Number of Magazines | 1 30 rd. |
| Capacity | 30 + 1 |
| Action | |
| Package Height | 7.0 |
| Package Width | 8.5 |
| Shipping Weight | 3.75 |
| Product Type | Accessory-Lowers |
| ATF Type | RECEIVER |
| Caliber/Gauge | Multi |
| Safety | Yes |
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