This Aero Precision M4E1-T Complete Upper includes the 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. The 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. FeaturesEnhanced forging that gives the upper receiver a "billet look"Picatinny profile that blends seamlessly with Enhanced Series Handguards.250 takedown pin holesLaser engraved T-marksIncludes port door and forward assist installed