The Aero Precision 12.7-inch MOD 4 M-LOK handguard in OD Green anodized (brand part no. APRA600013C) is built around the Minimal Optical Deflection idea: stiffness first, so the handguard flexes as little as possible under load. It is machined from 6061-T6 aluminum and clamps to the upper receiver through a steel barrel nut, which the maker says cuts point-of-impact shift when an infrared laser aiming device is mounted. Seven-sided M-LOK slots run the full length, and four steel-reinforced QD sockets keep standard steel sling attachments from wearing the sockets out. Aero designed the MOD 4 to match its M4E1 Threaded upper receivers and PRO-line parts, and it also fits mil-spec AR-15 uppers. At 12.7 inches it gives a builder plenty of rail for a light, a handstop or a bipod.

Key Specifications

• Overall handguard length is 12.7 inches, measured end to end the way Aero Precision rates all of its rail lengths.
• Construction is machined 6061-T6 aluminum, chosen for stiffness so the handguard resists deflection under load.
• The finish is OD Green anodized, which gives a durable color coat that also resists wear from handling.
• The attachment interface is a full-length, 7-sided M-LOK pattern, so lights, grips and rail sections bolt on anywhere you need them.
• Four steel-reinforced QD sockets are built in, which keeps standard steel sling attachments from wearing the sockets prematurely.
• The handguard mounts with a steel barrel nut that the maker says significantly reduces point-of-impact shift with an infrared laser aiming device under load.
• The barrel nut lug pattern matches a mil-spec castle nut, and timing is not required, so no specialty tools are needed to install it.
• Internal diameter is 1.2 inches, the clearance the handguard gives the barrel and gas system.
• Barrel nut torque is specified at 55 plus or minus 5 foot-pounds, the figure to use when installing the handguard.
• Weight is 16.12 ounces at the 12.7-inch length.

Frequently Asked Questions

Does the MOD 4 handguard need a special tool or barrel nut timing? No. Aero Precision eliminated the timing step, and the barrel nut lug pattern matches a mil-spec castle nut, so no specialty tool is needed. Two anti-rotation set screws add redundancy and a more tailored fit on third-party upper receivers.

Which upper receivers does it fit? It is designed to match Aero Precision M4E1 Threaded upper receivers and PRO-line components, and it is also compatible with mil-spec AR-15 uppers. The maker notes it may not fit uppers with unusual geometry or excess material near the thread end.

What comes in the box? The handguard ships with the MOD 4 barrel nut and the mounting hardware, and the maker states it works with low-profile gas blocks.

Buy the Aero Precision 12.7-Inch MOD 4 M-LOK Handguard, OD Green Anodized

Everything about the MOD 4 points at a stiff, repeatable mount for a laser or accessory-heavy build, finished here in OD Green anodized. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse more AR handguards while you build.