Machined from a solid aircraft aluminum block with tight tolerances to provide better accuracy, consistency, and durability Improved accuracy and ensure consistent air seal for VFC SCAR-L/H AEG series Precision rotary dial design for fine hopup adjustments Re-engineered the hopup levers and concave nubs to work best with R-hop and Standard-Hop to keep the BBs shooting straight and accurate on every single shot Removable Brass Threaded Slot Pin for setup and maintenance Fully compatible with most aftermarket soft and hard rubber bucking without losing FPS or dropping BBs Accepted the nozzle length from 21.00mm to 21.25mm on VFC SCAR-L and 38.50mm to 38.75mm on VFC SCAR-H Equipped with a new CNC Delrin Locking C-Clip design to hold barrel tight without wobbling and twisting Extended sliding arms design on both side of the chamber housing to ensure the hopup unit is always centered, straight and air tight at all times when closing the receivers The UV LED Tracer and Electronic Module to glow BBs in the dark ready! The Empty Magazine Detection Sensor to stop Motor/HPA firing ready! In the Box 1X CNC Aluminum Hopup Chamber SV unit 2X Strong Clear Vinyl Cover set 1X CNC Aluminum Standard-Hop Arm 1X CNC Aluminum R-Hop Arm 1X Silicone Rubber Standard-Hop Nub Damper 1X Silicone Rubber R-Hop Nub Damper 1X CNC Aluminum 4.5mm length Precision R-Hop Concave Nub 1X CNC Aluminum 6mm length Precision R-Hop Concave Nub 1X CNC Brass Threaded Slot Pin 1X CNC Delrin Locking C-Clip 1X CNC Barrel Brass Spacer 1X Brass Spacer Holder Oring 1X Steel Compression Spring Specifications: Brand Maxx Model Build Aluminum 6061 Compatibility VFC SCAR-L/H AEGs Length 48.35 mm Height 27 mm Color Orange California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov