Aero Precision M4E1 Builder Set – Freehand Arid – 9″ Atlas S-One M-LOK

The Aero Precision M4E1 Builder Set - Freehand Arid - 9" Atlas S-One M-LOK is known for its high-quality build, reliability, and performance. See the description above for full specs.

Yes, firearms can be purchased online and transferred to your local FFL for pickup.

Yes, we ship across the U.S., depending on state laws.

To buy a gun in Tennessee, you must be 18+ for rifles or 21+ for handguns, with valid ID and a background check.

Yes, a background check is required when picking up your firearm at an FFL dealer.

In-stock firearms usually ship to your local FFL within 3–5 business days.