Description
The Franklin Armory Pistol Built Lower is a complete AR-15 pistol lower receiver that arrives with the Franklin Armory Binary AR-Essential trigger already installed and an SB Tactical SBM4 brace on the buffer tube. Just add the upper of your choice and you have a finished AR pistol. This listing is UPC 818725013485 in black.
Franklin Armory Pistol Built Lower Overview
Building an AR pistol around a fast-firing trigger usually means buying a stripped lower, a parts kit, a brace and a trigger, then spending an evening fitting it all together. Franklin Armory skips those steps. The lower is forged from 7075-T6 aluminum, uses a specialized tension screw to take up slop between the upper and lower, and is finished in matte black. An A2-style pistol grip, a single-sided selector and a 30-round steel magazine round out the package.
How the AR-Essential Works
The AR-Essential is a two-mode binary trigger. In semi-auto mode it behaves like any standard AR trigger, firing once per pull. Rotate the selector to binary mode and the gun fires once when you press the trigger and again when you release it. That doubles the rate of fire you can practically achieve without changing the legal classification of the firearm. Many shooters find the release shot takes a short session to get used to, so start slow on a safe backstop and build up speed from there.
Forged Lower and Fit
A forged 7075-T6 receiver is the strong, proven choice for the AR platform. The tension screw lets you dial out wobble between receivers, which gives the finished pistol a tighter, more solid feel in the hand. Because it uses mil-spec dimensions, it pairs with nearly any standard 5.56 or 300 Blackout pistol upper on the market.
SBM4 Brace
The SB Tactical SBM4 brace slides over the receiver extension and gives the pistol a third point of contact. It is a slim, rubberized design that is light enough for a compact build and makes the gun far more comfortable to handle than a bare buffer tube.
Choosing an Upper
Barrel lengths from 7.5 to 11.5 inches are the most popular for AR pistols. A 10.5 inch 5.56 upper is a balanced choice for range use and home defense, while a 9 inch 300 Blackout upper runs quietly and works well with subsonic loads. Pick a quality upper with a properly staked gas key and a reliable bolt carrier group, since a fast trigger rewards a smooth running action.
Ammunition for a Binary Build
Binary mode burns through ammunition quickly, so plan on stocking up. Brass-cased 55 grain full metal jacket is the most common practice load for 5.56 and runs reliably in nearly every AR. Steel-cased ammo can work but tends to be dirtier and harder on extractors. Whatever you choose, test several magazines worth before trusting a new build.
Cleaning and Maintenance
Keep the bolt carrier group wet with a good lubricant and wipe carbon from the bolt tail and inside the carrier after each range trip. Check that the trigger pins are fully seated and the hammer spring legs are in the correct position whenever you have the lower open. A clean, well lubricated action keeps the binary function crisp and dependable.
Safe Storage at Home
Store the pistol unloaded in a locked safe or cabinet with ammunition kept separately, and teach everyone in the household basic safety rules. A cable lock adds an inexpensive extra layer for travel or range bags.
Range Day Checklist
Bring eye and ear protection for yourself and anyone nearby, a few loaded magazines, a small cleaning kit and a bottle of lubricant. A simple paper target at seven to fifteen yards is all you need to learn the release shot and confirm the sights or optic are zeroed. Take short breaks to let the barrel cool and check that everything is still tight.
Specifications
- Manufacturer: Franklin Armory
- Type: AR-15 pistol lower receiver, complete
- UPC: 818725013485
- Receiver: Forged 7075-T6 aluminum
- Trigger: Binary AR-Essential (semi and binary modes)
- Brace: SB Tactical SBM4
- Grip: A2 style pistol grip
- Selector: Single-sided
- Magazine: One 30-round steel
- Finish: Black
Before You Buy
This is a complete lower only; an upper receiver is not included. Franklin Armory does not sell binary-equipped lowers to residents of several states, including CA, CO, CT, DC, DE, HI, IL, MA, MD, NJ, NY, OR, RI and WA, and local rules can change. Some distributor listings describe this lower as BFSIII equipped, but the factory lists the AR-Essential trigger for this model, so please verify the trigger type at pickup if that difference matters to you.
Who It Is For
The Franklin Armory Pistol Built Lower is a great fit for shooters who want a fast, fun AR-15 pistol lower that is ready to go, without the hassle of building one from parts. It also makes a great second lower for anyone who already owns a pistol upper.
Buy the Franklin Armory Pistol Built Lower at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Franklin Armory Pistol Built Lower online and ship it to your local FFL dealer, or browse our full selection of firearms for more AR lowers and pistols. For factory details, visit Franklin Armory.
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