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Most binary trigger builds start with someone buying the trigger separately and installing it themselves. Franklin Armory skips that step entirely with the BFSIII M4-SBR-L XTD, dropping their Binary Firing System III into a fully dressed 5.56 NATO rifle from the factory. The trigger runs three positions: safe, standard semi-auto, and binary mode, which fires one round on the pull and another on the release. If you change your mind mid-pull, flipping the selector out of binary mode cancels the release round. It's a genuinely fun way to run an AR, and it tightens up split times in a way a standard trigger just can't match.
This is the upgraded XTD trim, and it shows. The 16 inch M4 contour barrel wears a 1:7 twist that stabilizes heavier 5.56 loads, and the Triumvir muzzle device up front cuts flash, tames muzzle rise, and pushes the report forward and away from you. A midlength gas system with a low profile gas block keeps cycling smooth, and the salt bath nitride bolt carrier group holds up well to high round counts with easier cleanup. The 15 inch FSR M-LOK handguard gives you a full length Picatinny top rail plus plenty of real estate for lights, lasers, or a bipod.
Instead of bargain-bin plastic, Franklin Armory fitted this rifle with Magpul MBUS flip-up sights front and rear, a Magpul CTR adjustable stock, and an Ergo Ambi SureGrip. Bilateral push button QD mounts make sling setup simple no matter which shoulder you favor, and the black hardcoat anodized finish keeps the whole package looking sharp.
Binary mode takes a little practice to find your cadence, but once it clicks, controlled pairs come fast and consistent. Flip to standard semi and it behaves like any quality AR for zeroing, drills, or just a relaxed range day. It ships with one 30 round magazine, so grab your ammo and go make some noise.
The BFSIII is a three-position trigger. Position one is safe, position two fires like a normal semi-auto trigger, and position three is binary mode, which fires one round when you pull the trigger and a second round when you release it. If you're holding the trigger back in binary mode and don't want to fire the release round, you can cancel it by moving the selector out of binary mode before letting go.
It ships with Magpul MBUS flip-up sights on both the front and rear, so you can head to the range without buying anything extra. The 15 inch handguard has a full length Picatinny top rail, so adding a red dot or LPVO down the road is easy, and the MBUS set folds flat to stay out of the way.
The 1:7 twist rate handles the full range of common 5.56 and .223 bullet weights, but it really shines with heavier projectiles in the 62 to 77 grain range. Lighter 55 grain plinking ammo runs fine for range days too. For binary mode sessions, quality brass-cased ammo tends to give the most consistent cycling.
Yes, the XTD is the upgraded version. Where the base M4 uses an A2 grip, basic carbine stock, and comes optics-ready without sights, the SBR-L XTD adds Magpul MBUS sights, a Magpul CTR stock, an Ergo Ambi SureGrip, the Triumvir muzzle device, and bilateral QD sling mounts. It's a more complete package straight from the factory.
| UPC | 818725011061 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 00-10028-BLK |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 30 + 1 |
| Number of Magazines | 1 30 rd. |
| Shipping Weight | 14.85 |
| Sights | Magpul MBUS |
| Units per Box | 1 |
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