Aero Precision M4E1 5.56 NATO Custom AR-15 with BCM 16-inch ELW Upper, MCMR-15 Handguard, LaRue MBT-2S, MBUS Pro Sights
This custom AR-15 pairs an Aero Precision M4E1 lower with a BCM 16-inch ELW mid-length upper for a lightweight, free-floated 5.56 NATO build. It is equipped with a LaRue Tactical MBT-2S two-stage trigger, BCM Mk2 A5-length buffer system, Magpul MBUS Pro steel flip-up sights, and a 15-inch BCM MCMR M-LOK handguard. Practical upgrades include a Magpul CTR stock, Magpul MOE+ grip, BCM M-LOK Mod 3 vertical grip, and a Streamlight ProTac 2.0 Rail Mount weapon light. It comes with three 30-round PMAG Gen M3 magazines and a Savior Equipment American Classic Shorty double rifle soft case.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Specific Condition Notes: Minimal markings from previous handling or use. The bore is bright and clean.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
What’s Included
- Aero Precision M4E1/BCM custom 5.56 NATO semi-automatic rifle
- 3x 30-round Magpul PMAG Gen M3 5.56x45 magazines
- Magpul MBUS Pro front and rear flip-up iron sights
- BCM M-LOK Vertical Grip Mod 3
- BCM MCMR-SM QD sling mount
- Streamlight ProTac 2.0 Rail Mount weapon light
- Savior Equipment American Classic Shorty double rifle soft case
The lower receiver is an Aero Precision M4E1 forged 7075-T6 unit with Type III hard-coat anodizing. It incorporates a flared magwell, integral trigger guard, threaded bolt-catch pin, and an upper-tension screw. Controls feature SAFE/FIRE pictograms. Markings include AERO PRECISION LAKEWOOD, WA and MOD M4E1 / CAL MULTI. The build uses an Aero Precision LPK (minus FCG/trigger guard) combined with the LaRue Tactical MBT-2S two-stage trigger for a clean, predictable break.
The complete upper is a BCM 16-inch ELW mid-length assembly with BCM bolt carrier group and charging handle. A 15-inch BCM MCMR free-float handguard in 6061-T6 aluminum provides M-LOK slots along the length and a continuous, T-marked top rail (T4–T46). A BCM MCMR-SM QD sling mount and BCM M-LOK Mod 3 vertical grip are installed. The barrel is threaded and fitted with an A2-pattern flash suppressor secured by a crush washer.
Furniture and recoil components are set up for control and durability. The stock is a Magpul CTR on a mil-spec tube, paired with a BCM Mk2 (A5-length) buffer system. The grip is a Magpul MOE+, and the length of pull measures 13.25 inches. This configuration supports the mid-length, direct-impingement gas system for smooth cycling in 5.56x45 NATO.
Sighting and accessory capability are well covered. The rifle includes Magpul MBUS Pro steel flip-up sights (front and rear). A Streamlight ProTac 2.0 Rail Mount weapon light is installed for illumination. The BCM MCMR handguard offers extensive M-LOK real estate for additional accessories as needed.
Magazine compatibility follows the STANAG 5.56 pattern with a stated capacity of 30+1. The package includes three Magpul PMAG Gen M3 30-round magazines and ships with a Savior Equipment American Classic Shorty soft case for protected transport and storage. This build is manufactured in the United States and configured in 5.56 NATO with a 16-inch barrel and direct-impingement operation.