Aero Precision M4E1 Custom AR-15 in 6mm ARC, 20 in Stainless Fluted Heavy Barrel, ATLAS R-ONE Free-Float, Luth-AR Adjustable Stock, Upgraded Trigger, FDE
This Aero Precision M4E1 is a custom AR-15 build chambered in 6mm ARC and configured for precision-focused performance. It features a 20-inch stainless fluted heavy barrel with a threaded muzzle, an Aero Precision ATLAS R-ONE free-float M-LOK handguard, and a Luth-AR adjustable stock in FDE. The rifle includes an upgraded flat-faced trigger, forged aluminum receivers with Aero markings, and three 10-round magazines. The bore is excellent, and the rifle shows minimal signs of prior handling.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from previous handling and use. Please refer to the photos for close-up views of the surfaces and finish.
What’s Included
- Three 10-round detachable metal AR-15 pattern magazines
- JP Enterprises AR-15 Accuracy Spring Pack (not installed)
Built on Aero Precision M4E1 forged aluminum receivers, this rifle carries the maker's rollmarks: "MOD M4E1" and "CAL MULTI" with "AERO PRECISION, LAKEWOOD, WA." The lower features the M4E1's integrated trigger guard, and the receiver set wears a tan/FDE finish. The ejection port cover includes a U.S. flag motif.
The 20-inch stainless steel barrel is fluted with a heavy profile and a threaded muzzle, offering a durable, heat-managing setup. No muzzle device is installed. A low-profile gas block is visible through the handguard slots, and the rifle uses a direct impingement, semi-automatic operating system.
An Aero Precision ATLAS R-ONE free-float M-LOK handguard (aluminum) provides a rigid, lightweight front end and is marked "ATLAS R-ONE / PATENT PENDING / AERO PRECISION, LLC, TACOMA, WA." The free-float design leaves the barrel unobstructed and ready for accessory placement via M-LOK slots.
Ergonomics and control are enhanced by a Luth-AR adjustable carbine stock in FDE with cheek height and length-of-pull adjustments (13.25-inch LOP), paired with a Magpul MOE-K2 pistol grip. An upgraded flat-faced trigger is installed, and a JP Enterprises AR-15 Accuracy Spring Pack is included loose for those who want additional trigger tuning options.
The rifle feeds from detachable box magazines and has a 10+1 capacity. It is configured without sights. The color-matched FDE finish across the receivers and stock ties the build together, and the rifle is made in the United States.