The AR-15 ATLAS S-ONE M-LOK free-floating slim line handguards are machined from 6061-T6 aluminum, and have been designed with size and weight in mind, to provide a premium handguard solution for lightweight MSR builds. The handguards have a slim profile, but maintain the strength and stability shooters require, and have come to expect from Aero Precision handguards. The AR-15 ATLAS S-ONE slim line handguards use the new Aero Taper Lock Attachment System (ATLAS), which is both functional and pleasing to look at. It uses two mirrored tapered locking nuts that allow for even clamping pressure to be distributed across a custom barrel nut with a turnbuckle screw. Length – 7" - 7.25", 9" - 9.19", 12" - 12.56", 15" - 14.94" Available in Black and FDE Front and rear picatinny rail Reduced weight by eliminating center of top rail Indexing grooves in 12 o’clock position for positive grip control 1.3” I.D. – 1.5” O.D. The AR-15 ATLAS S-ONE slim line handguards include all required mounting hardware. Aero Precision rail lengths measure from end to end. this is the point of contact at the receiver to the end of the last picatinny slot at the muzzle.