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The slimline handguards of the AR-15 ATLAS S-ONE M-LOK are made of 6061-T6 aluminum, designed to provide a premium solution for lightweight MSR builds without compromising strength and stability. With a slim profile, these handguards can easily meet the expectations of shooters with regard to strength. The new Aero Taper Lock Attachment System (ATLAS) used in the slimline handguards has two mirrored tapered locking nuts that distribute clamping pressure evenly across a custom barrel nut with a turnbuckle screw. Available in Black and FDE colors, the handguards come in lengths of 7" - 7.25", 9" - 9.19", 12" - 12.56", 15" - 14.94", and have front and rear picatinny rails. The slimline handguards have a reduced weight by eliminating the center of the top rail and indexing grooves in the 12 o'clock position providing grip control. The inside diameter is 1.3” and outside diameter is 1.5”. The AR-15 ATLAS S-ONE slimline handguards come with all required mounting gear. Note that the Aero Precision rail lengths measure from the receiver's point of contact to the last picatinny slot at the muzzle.