"The Aero Precision M4E1 Pro AR-15 Semi-Auto Rifle leaves plain-jane MSRs in the dust with upgraded components inside and out to create the ultimate AR. Built around Aero's own forged 7075-T6 upper and lower, it features a cold hammer-forged, government-profile, chrome-lined barrel. The chrome-lined, phosphated M16 bolt carrier group runs smoothly and is built to handle full-auto. Fully ambidextrous controls make it easy to operate, and the Magpul MOE SL stock and grip provide comfortable handling. ALG QMS single-stage trigger. 15"" MOD 4 M-LOK handguard. Mid-length gas system with low-profile gas block. Aero Precision enhanced buffer tube and H buffer. EZ install takedown/pivot pins. 15"" MOD 4 handguard with M-LOK slots Cold hammer-forged, government-profile, chrome-lined barrel Mid-length gas system with low-profile gas block Chrome-lined, phosphated M16 bolt carrier group ALG QMS single-stage trigger Magpul MOE SL stock and grip BREACH ambidextrous charging handle PRO ambidextrous safety Aero Precision enhanced buffer tube and H buffer EZ install takedown/pivot pins"