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The Franklin Armory BFSIII M4-BLR is a complete, ready-to-use lower receiver that cuts out all the hassle of assembly. Whether you’re building your first AR or your fifth, having the binary trigger already installed and tested from the factory saves time and frustration. The lower is forged from 7075-T6 aluminum and finished with a hard coat Type III anodize that holds up to regular range use and outdoor conditions.
Not for civilian sales in: CA, CT, DC, DE, FL, HI, IL, MA, MD, NJ, NY, OR, RI, VA, and WA
You get a 3-position fire control system: safe locks everything down, semi-auto delivers the traditional one round per trigger pull, and binary mode fires one round when you pull and another when you release. That binary feature is what sets this apart, letting you achieve rapid accurate pairs with smooth, coordinated trigger movements. It works on any upper receiver you want to mate to it.
Instead of wrestling with springs, hammer pins, and trigger assemblies, this lower comes completely set up. The specialized tension screw handles upper receiver fit without wobble, something a lot of builders end up cursing about when they notice play between their halves. Comes with a 6-position M4-style collapsible stock for length adjustment, a standard A2 pistol grip, and one stainless steel 30-round magazine.
This is the platform that makes the whole AR come together. Once you attach an upper receiver and charge handle, you have a functional rifle. The binary trigger makes it suitable for range fun, tactical training, or competition shooting where permitted. The forged receiver gives you a solid foundation that’ll run indefinitely with basic maintenance.
The BFSIII has a 3-position fire control: safe (no fire), semi-auto (one round per pull), and binary (one round on pull, one on release). In binary mode you get rapid, accurate pairs without needing full-auto. You just flip the selector to change modes based on how you want to shoot that day.
Yes, completely. Everything is installed and tested at the factory. You just need a compatible AR15 upper receiver and bolt carrier group. Once mated together with two takedown pins, you have a functional rifle.
The tension screw is designed to eliminate upper and lower receiver play, giving you a snug fit without wobble between the two halves. This matters for both reliability and accuracy, and it saves you from having to fiddle with shims or tape to get a tight fit.
Yes, this lower is built to standard AR15 specifications and accepts any mil-spec upper receiver. Whether your upper is 16 inch, 18 inch, or even a pistol configuration, this lower will work with it.
One stainless steel magazine with 30-round capacity for 5.56 NATO. The magazine has an anti-tilt follower for reliable feeding and is finished with a Marlube coating for smooth operation and corrosion resistance.
Absolutely. The 3-position selector lets you switch between safe, semi-auto, and binary mode. You can run it in full semi-auto mode if binary isn’t for you or isn’t permitted at your range, and the trigger still breaks clean in that position.
| UPC | 818725013249 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 00-20024-BLK |
| Action | |
| ATF Type | RECEIVER |
| Caliber/Gauge | Multi |
| Capacity | 30 + 1 |
| Length | 16.0500 |
| Number of Magazines | 1 30 rd. |
| Package Height | 4.7 |
| Package Width | 8.2 |
| Product Type | Accessory-Lowers |
| Safety | Yes |
| Shipping Weight | 3.3 |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
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