The Aero Precision MOD 4 handguard in 13.5-inch is a precision-engineered rail system built for shooters who demand stiffness, reliability, and minimal deflection under load. Machined from 6061-T6 aluminum and secured by a steel barrel nut, this AR-15 handguard is designed to keep your point of impact stable—especially critical if you're running an infrared laser or other mounted optics that depend on a rigid platform. Whether you're building a precision rifle, a duty gun, or a tactical setup, the MOD 4 delivers the kind of no-compromise performance Aero Precision is known for.

Installation is straightforward: the barrel nut requires no timing and its lug pattern matches standard mil-spec castle nuts, so you won't need specialty tools. Two anti-rotation set screws provide redundancy and ensure a solid fit on third-party uppers as well as Aero's own M4E1 Threaded Upper Receivers. The full-length 7-sided M-LOK interface runs the entire length of the rail, giving you complete flexibility to mount lights, grips, panels, or other accessories exactly where you need them. Four steel-reinforced QD sockets—a detail that matters more than it sounds—are built to handle repeated attachment cycles without wearing out.

At 13.5 inches, this handguard strikes a practical balance: long enough to support modern rail systems and optic setups without overextending your control zone. The 1.2-inch internal diameter is compatible with low-profile gas blocks, making it suitable for a wide range of upper receiver configurations. At 16.75 ounces, it keeps weight reasonable while maintaining the stiffness that separates quality rails from budget alternatives.

The Aero Precision MOD 4 handguard in 13.5-inch is a precision-engineered rail system built for shooters who demand stiffness, reliability, and minimal deflection under load. Machined from 6061-T6 aluminum and secured by a steel barrel nut, this AR-15 handguard is designed to keep your point of impact stable—especially critical if you're running an infrared laser or other mounted optics that depend on a rigid platform. Whether you're building a precision rifle, a duty gun, or a tactical setup, the MOD 4 delivers the kind of no-compromise performance Aero Precision is known for.

Installation is straightforward: the barrel nut requires no timing and its lug pattern matches standard mil-spec castle nuts, so you won't need specialty tools. Two anti-rotation set screws provide redundancy and ensure a solid fit on third-party uppers as well as Aero's own M4E1 Threaded Upper Receivers. The full-length 7-sided M-LOK interface runs the entire length of the rail, giving you complete flexibility to mount lights, grips, panels, or other accessories exactly where you need them. Four steel-reinforced QD sockets—a detail that matters more than it sounds—are built to handle repeated attachment cycles without wearing out.

At 13.5 inches, this handguard strikes a practical balance: long enough to support modern rail systems and optic setups without overextending your control zone. The 1.2-inch internal diameter is compatible with low-profile gas blocks, making it suitable for a wide range of upper receiver configurations. At 16.75 ounces, it keeps weight reasonable while maintaining the stiffness that separates quality rails from budget alternatives.