San Tan Tactical PILLAR(R) Truss Pockets For Increased Structural Rigidity. – Cut From A Single Billet Of 7075 -T651 Aerospace Grade Aluminum. – Shell Deflector – Machined In T Markings For Easy Optic Relocation. – Machined With M4 Feed Ramps. – Machined To Mil-Spec Standards. – Interfaces With All AR15/M16/M4 Weapons Systems And Accessories. – Accepts ALL Known Handguards Without Modifications. – Mil Spec Type III Class II Hard Coat Anodized Black – Compatible With All Known Battery Assist Levers On The Market Today. – Backed By STT’s Unmatched Lifetime Warranty. – Made In The USA. – Does Not Include Port Door Assembly.