Franklin Armory M4SBRL XTD 5.56 16″ BFSIII – Powerful Binary Trigger Rifle

Description

The Franklin Armory M4SBRL XTD is a 16-inch AR-15 rifle chambered in 5.56 NATO that comes equipped with the Franklin Armory BFSIII binary firing system. This model (Franklin Armory FY1242BLK, UPC 818725011061) pairs a salt bath nitride M4 barrel with a 15-inch FSR free-float handguard, Magpul MBUS sights and a Libertas billet lower in black.

Franklin Armory M4SBRL XTD Overview

Franklin Armory is best known for its binary firing systems, and this rifle shows off the BFSIII in a premium package. The Franklin Armory M4SBRL XTD is built around a 16-inch M4-profile barrel with a 1:7 twist, a mid-length low-profile gas system and a Triumvir muzzle device, all wrapped in a slim, modern free-float handguard.

BFSIII Binary Firing System

The BFSIII trigger has three selectable modes: safe, semi-automatic and binary. In binary mode the rifle fires one round when the trigger is pulled and another when it is released, delivering very fast follow-up shots for training and fun at the range. A selector lets you switch back to standard semi-automatic in an instant.

Barrel, Gas System and Muzzle Device

The 16-inch M4-contour barrel is salt bath nitride treated for corrosion resistance and long life, with a 1:7 twist that stabilizes a wide range of 5.56 and .223 bullet weights. A mid-length low-profile gas system gives softer, smoother cycling than a carbine-length system, and the Triumvir muzzle device helps control muzzle rise.

Furniture and Controls

The 15-inch FSR free-float handguard gives plenty of room for lights and grips and carries bilateral push-button QD sling mounts. A Magpul CTR stock adjusts for length of pull, the Ergo Ambi Sure grip gives a secure hold, and Magpul MBUS folding sights provide reliable backup aiming. The salt bath nitride bolt carrier group runs clean and resists wear.

Range and Training Tips

Learn the rifle in semi-automatic mode first, then move to binary mode once you are comfortable with recoil management and trigger reset. Always keep the muzzle in a safe direction when releasing the trigger in binary mode, because the release fires a round. Use quality, consistent ammunition and lubricate the bolt carrier group before range sessions.

Choosing Optics

A red dot or low-power variable optic in the 1-6x or 1-8x range turns this rifle into a fast, versatile home defense and range carbine. Mount it on the upper receiver rail at a comfortable eye relief, and co-witness with the Magpul MBUS sights as a backup.

Cleaning and Maintenance

Clean the bolt carrier group and chamber after each range session, run a few patches through the bore and wipe carbon from the bolt tail. Keep the carrier rails and bolt lightly lubricated, and inspect the binary trigger pack per Franklin Armory guidance.

Safe Storage at Home

Any firearm kept in the home should be stored unloaded in a locked safe or cabinet, with ammunition kept separately. A quick-access vault near the bedroom can work well for a defensive long gun, while a larger safe is the better choice for a collection. Cable locks are an inexpensive extra layer, and teaching every member of the household basic safety rules is just as important as any piece of hardware.

Transfer and Pickup

Every rifle we sell ships to our Collegeville, Pennsylvania shop or to a licensed dealer of your choice, where the transfer is completed with a background check. Bring a valid photo ID, and please review your state and local rules before ordering, since some areas restrict certain trigger types, magazine capacities or features. Our staff is glad to answer questions about the process before you buy.

Accessories Worth Adding

A quality two-point sling makes the gun far easier to carry and helps stabilize shooting positions. Spare magazines let you spend more range time shooting and less time reloading. A compact weapon light is a smart addition for a home defense role, and a padded soft case or hard case protects the finish and sights during travel to and from the range. Eye and ear protection should always come along as well, for you and anyone standing nearby.

Breaking In a New Rifle

Before the first range trip, field strip the gun, wipe out any packing oil from the bore and apply a light coat of lubricant to the bolt carrier group. Fire the first few hundred rounds with quality brass-cased ammunition and check for any looseness in the optic mount or muzzle device. Clean the bore after the first session and inspect the gas key and extractor, then settle into a routine that fits how often you shoot.

Specifications

• Manufacturer: Franklin Armory
• Model: M4SBRL XTD (FY1242BLK)
• UPC: 818725011061
• Caliber: 5.56 NATO
• Action: semi-automatic AR-15 with BFSIII binary trigger
• Barrel: 16-inch M4 profile, salt bath nitride, 1:7 twist, threaded
• Gas system: mid-length, low profile
• Muzzle device: Triumvir
• Handguard: 15-inch FSR free float, bilateral QD mounts
• Sights: Magpul MBUS front and rear
• Lower: Libertas
• Stock: Magpul CTR
• Grip: Ergo Ambi Sure
• Bolt carrier: salt bath nitride
• Magazines: 1 included (30 round)
• Color: black

Before You Buy

Binary triggers are not legal in every state or locality; confirm that a binary firing system is legal where you live before ordering. Binary mode fires on both pull and release, so read the manual and practice under controlled conditions.

Who It Is For

The Franklin Armory M4SBRL XTD is a great fit for AR-15 owners who want a premium, ready-to-run rifle with the fun and speed of a binary trigger, and anyone looking for a quality range and home defense carbine.

Buy the Franklin Armory M4SBRL XTD at MAG5 Firearms

MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Franklin Armory M4SBRL XTD online and ship it to your local FFL dealer, or browse our full selection of firearms for more handguns. For factory details, visit Franklin Armory.