Aero Precision M4E1 ATLAS R-ONE 5.56 NATO Semi-Auto Rifle, 16.5" Barrel, Free-Float M-LOK Handguard, B5 Systems Stock, Black
This Aero Precision M4E1 combines forged aluminum receivers with the lightweight ATLAS R-ONE free-float M-LOK handguard for a clean, modern AR-15 build. It features a 16.5" threaded barrel capped with a multi-port brake/compensator, a B5 Systems adjustable carbine stock with QD socket, and a Magpul MOE pistol grip. The bore is excellent with a mirror finish, and the rifle includes one 30-round Magpul PMAG.
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 widespread scratches and blemishes from prior handling and use.
What’s Included
- 1x 30-round Magpul PMAG polymer AR-15 magazine (5.56×45mm)
The M4E1 upper and lower receivers are forged aluminum with Aero Precision's integrated trigger guard, a flared magazine well for smoother reloads, and a threaded bolt-catch pin. The upper includes a forward assist, brass deflector, and standard ejection-port door. Receiver markings note Aero Precision LLC, Tacoma, WA.
Its ATLAS R-ONE free-float handguard is 6061-T6 aluminum with M-LOK slots for accessories and a Picatinny top rail. A low-profile gas block is fitted under the handguard, and the rifle uses a direct impingement system.
The 16.5" barrel is threaded and fitted with a multi-port brake/compensator featuring forward prongs. Chambered in 5.56 NATO, the platform uses the standard AR-15/STANAG magazine interface with a stated capacity of 30+1.
Furniture includes a B5 Systems adjustable carbine stock with a QD sling socket and a Magpul MOE pistol grip. The rifle is finished in black anodize with a flat-top rail and no installed sights. Length of pull is stated at 10.5–14 inches. Made in the United States.