The Reptilia 10.5" M-LOK Handguard is a rigid, free-float rail system designed for the AR15 platform and compatible with all M4 upper receivers. It distinguishes itself with patented turnbuckle technology, which uses a reverse-threaded nut assembly to apply high-tension pressure against a standard 1.25-inch barrel nut, ensuring a secure, anti-rotational lockup without the need for traditional anti-rotation pins. Precision-machined from billet 7075-T6 aluminum, this handguard features seven sides of M-LOK mounting slots and a full-length Picatinny top rail with angled front cuts to improve access to muzzle devices or suppressors. The slim profile is finished with a MIL-STD Type III hardcoat anodizing, providing a durable, corrosion-resistant surface for professional or competitive use. Reptilia 10.5" M-LOK Black Handguard for M4 Upper Receivers 100-356