The ATLAS R-ONE is the newest addition to the Aero Precision Handguard lineup. Machined from 6061-T6 Aluminum, the R-ONE line of handguards are designed with size and weight in mind, providing the perfect handguard for 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.ATLASThe new Aero Taper Lock Attachment System (ATLAS) is both functional and aesthetically pleasing. It features 2 mirrored tapered locking nuts that provide evenly distributed clamping pressure across a custom engineered barrel nut with use of a turnbuckle screw. A ratcheting detent further secures the design while providing positive registration during installation. By design, the even pressure of the ATLAS system avoids distortion of the handguard often seen with current applications during installation.All hardware mounting parts are included with the purchase of an ATLAS Handguard.Lightweight By Design KeyMod Handguard Weights: 7" - 5.12 oz / 9" - 5.92 oz / 12" - 7.84 oz / 15" - 8.96 oz M-LOK Handguard Weights: 7" - 5.22 oz / 9" - 6.03 oz / 12" - 8 oz / 15" - 9.07 oz Mounting Hardware Weight: 4.72 oz (same across all ATLAS Handguard options)Features: Full top picatinny rail for optional attachments Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Compatible with low profile gas blocks 1.3" Inside diameter 1.5" Outside diameter Compatible with mil-spec AR-15 upper receivers and barrels Each handguard is Cerakoted for durability and blemish resistanceATLAS Handguards are designed to match seamlessly with our M4E1 Threaded Upper Receivers. Additionally, they are compatible with any Mil-Spec AR-15 upper receivers as well. However, they may not be compatible with billet upper receivers due to indexing tabs.Please note: The ATLAS Handguards are NOT compatible with our M4E1 Enhanced Upper Receiver, you must get the M4E1 Threaded Upper Receiver instead.Please note: This product may arrive in a plain box or polybag due to manufacturer bulk packaging.