CNC aluminum construction Compatible with Version 2 and 3 gearboxes Special Trumpet design functioned to deliver optimal compression of air towards the barrel Functioned to minimize loss of compressions with the double o-ring rubber seals system Rubber pad on back side Blue anodized finish In the Box 1X Cylinder Head Specifications: Brand Lancer Tactical Build CNC aluminum Compatibility Version 2 Airsoft AEG Gearboxes Color Blue California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov