The Aero Precision MOD 4 M-Lok Handguard (Aero Precision part number APRA600003C) is a 12.7-inch free-float rail machined from 6061-T6 aluminum for AR-platform rifles. Aero Precision calls it a Minimal Optical Deflection design, meaning the profile is built to reduce deflection under load without piling on weight or bulk. It attaches to the upper receiver through a steel barrel nut, a detail that matters more than it sounds like: that steel nut significantly cuts point-of-impact shift when running an infrared laser aiming device under load, which is exactly the kind of consistency serious shooters and duty-minded builders look for. The result is a handguard that feels light in hand but stays true to zero when it counts.

Key Specifications

• Length is 12.7 inches, enough for lights, optics, and grip accessories without excess weight forward.
• Attachment slots are M-Lok pattern, the current standard for direct-mount accessories.
• Construction is 6061-T6 aluminum, chosen for its strength-to-weight ratio in a free-float handguard.
• A steel barrel nut interfaces the handguard to the upper receiver, reducing point-of-impact shift under an IR laser load.
• The MOD 4 profile is engineered for minimal optical deflection, keeping the sight picture consistent under recoil.

Frequently Asked Questions

Does this handguard use M-Lok attachment? Yes, the MOD 4 uses M-Lok slots for mounting lights, grips, and other accessories directly to the rail.

What is the barrel nut made of? A steel barrel nut interfaces the handguard to the upper receiver, which helps minimize point-of-impact shift when running an infrared laser under load.

Is this a free-float design? Yes, the MOD 4 free-floats around the barrel rather than contacting it, which helps preserve accuracy.

Buy the Aero Precision MOD 4 M-Lok Handguard

Build a rifle that holds zero the way it is supposed to. The Aero Precision MOD 4 pairs a stiff, lightweight 6061-T6 aluminum body with a steel barrel nut engineered to limit point-of-impact shift, all in a 12.7-inch M-Lok package. Browse our full AR handguard selection and order from our Lubbock, Texas gun shop for direct shipping as soon as it is ready to send.