Franklin Armory BFSIII M4 7075-T6 Aluminum Black Hardcoat Anodized Multi-Cal Lower Receiver w/ Binary Trigger

The Franklin Armory BFSIII M4 lower receiver is a fully assembled multi-caliber AR-15/M4-pattern lower built around Franklin Armory's Binary Firing System III trigger. The receiver is forged from 7075-T6 aluminum and finished in hard coat type III anodized black for outstanding wear and corrosion resistance in hard-use conditions.

At the heart of this lower is the BFSIII binary trigger, which produces one round on the pull of the trigger and a second round on the release, giving the shooter rapid follow-up shots in binary mode. A specialized tension screw is built into the receiver to take up upper-to-lower play for a tight, rattle-free fit between the two halves. The lower is outfitted with a classic black A2 pistol grip and an M4-style reinforced six-position stock for adjustable length-of-pull across different shooting stances or layers of clothing.

A 30-round 5.56 NATO magazine ships with the lower, manufactured from stainless steel with a Marlube finish for smooth and reliable feeding. Compatible Franklin Armory 10/20 and 10/30 magazine configurations are also supported. This is a complete, serialized AR-15/M4-pattern lower receiver ready to pair with a compatible upper to build out a rifle.

DISCLAIMER: Firearms and receivers are subject to state-specific shipping restrictions and must be transferred through a valid FFL dealer. Please visit our shipping restrictions page to review all applicable restrictions for your state. Subject to change.