The UTG Pro Monolithic Handguard is precision machined from 6061-T6 Aluminum and finished in a matte Black Anodization. This handguard is designed for 9mm receiver HK MP5 and clones and compatible with most collapsible and fixed stocks. The Monolithic design combines M-LOK and optics real estate into one rigid mount. Features6061-T6 Aluminum with Dehorned Corners and Melted Contours and Finished in H-146 Graphite Black CerakotePatented Claw Mount Locking InterfaceExtended 16 Slot Picatinny Flat-Top with Cutout for Serial Number Identification17 Full and 5 Half M-LOK Slots Around Circumference of HandguardChamfered Locking Recess Notch Prevents Hot Spots and Snag Points while Manipulating Charging HandleOverall Lightweight at 9.8oz InstalledIntegral Left and Right Side Anti-Rotational QD Sockets