Brownells is offering the Aero Precision M4E1 with a choice of three different optics! We are offering this upper with the Eotech EXPS2-0, EXPS3-0, or the Sig Sauer Tango MSR 1-6x24mm Scope! This assembled upper includes Aero Precision's new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. Includes: M4E1 T Mfg: Brownells Bundles