Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Quick View Quick View Complete UppersM4E1 Threaded 7.5″ 5.56 Complete Upper Receiver w/ ATLAS S-ONE Handguard $425.00 Add to cart Quick View Quick View Complete UppersM4E1 Threaded Complete Upper, 16″ .300 Blackout Barrel, 12″ M-LOK ATLAS S-ONE Handguard – Anodized Black $475.00 Add to cart