This SIG MPX PCC 12.76" handguard upgrade features a built in Picatinny top rail for SIG MPX PCC accessories and optics. This Sig MPX handguard upgrade has seven rows of M-Lok slots for picatinny rails it is a simple drop-in design. This aftermarket M-lox Sig MPX handguard is slim and light weight and utilizes standard factory mounting points and hardware, so no modifications to your Sig MXP firearm is necessary. The M-Lok handguard is precision CNC machined from hard-anodized aluminum with lightweight construction for rugged performance without weighing you down. The slim design remains true to the unique lines of your MPX rifle but provides a built in Picatinny top rail and seven planes of M-LOK mounting surface to accommodate todays modern M-LOK accessories. Aim sports limited lifetime warranty.