The Franklin Armory M4-BLR Complete AR-15 Lower Receiver (part no. 00-20024-BLK) ships as a full build in one package: a forged 7075-T6 aluminum lower with a Type III hard-coat anodized black finish, Franklin Armory’s AR-ESSENTIALS trigger, an A2 pistol grip, a reinforced six-position collapsible M4-pattern stock, and a 30-round 5.56 NATO stainless steel magazine with an anti-tilt follower. This model comes equipped with Franklin Armory’s BFSIII trigger technology, a commercially available, ATF-classified semi-automatic trigger that fires one round on the trigger pull and one round on the release; it does not fire automatically and is not select-fire. A specialized tension screw eliminates upper/lower play, and the stock adds multiple rear sling mounts with an angled heel for faster shoulder transitions. Availability varies by state; check your local regulations before ordering.

Key Specifications

• Forged from 7075-T6 aluminum with a Type III hard-coat anodized black finish.
• Equipped with Franklin Armory’s BFSIII binary trigger, a semi-automatic-only trigger that fires once on the pull and once on the release.
• Includes a specialized tension screw to eliminate upper/lower receiver play.
• Fitted with an A2 pistol grip.
• Ships with a 30-round 5.56 NATO stainless steel magazine with an anti-tilt follower.
• Features a reinforced six-position collapsible M4 stock with multiple rear sling mounts.
• Stock includes an angled heel for faster shoulder transitions.
• Uses an aluminum carbine-length receiver extension.
• Includes a comprehensive safety manual and cable lock.

Frequently Asked Questions

Does the BFSIII trigger fire automatically? No. It is a commercially available, semi-automatic-only trigger that fires one round on the pull and one on the release; it is not select-fire or automatic.

Does this lower ship with a magazine? Yes, it includes a 30-round 5.56 NATO stainless steel magazine with an anti-tilt follower.

Does this require an FFL transfer? Yes, as a complete lower receiver it must transfer through your local FFL, and availability varies by state.

Buy the Franklin Armory M4-BLR Complete Lower Receiver

Get a full build in one package from Franklin Armory. Browse more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.