Aero Precision M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver w/ ATLAS S-ONE Handguard
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This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Our 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.