Aero Precision Atlas S-One, M-LOK Handguard, Fits AR10 Rifles, 12.7 Long, Anodized Finish, Black APRA538104A The ATLAS S-ONE is the newest addition to the Aero Precision Handguard lineup. Machined from 6061-T6 Aluminum" the S-ONE line of handguards are designed with size and weight in mind" providing the perfect handguard for your lightweight build. Their 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.