MATERIAL: 3D Printed PETG INSTALLATION: Purchase includes 3D printed barrel band assembly and M3 Mounting Hardware. WARNING! Confirm air gun is unloaded and safe before beginning installation. 1. Remove any barrel accessories from the end of the shroud (moderators, thread protector, etc) 2. Remove the threaded foster fill cap from the end of the tube (not required for bottle models). 3. Slide barrel band assembly over shroud and tube/bottle. NOTE: This will be snug and may require you to separate the barrel band by pulling out on the sides or squeezing the top and bottom while working it into place. Be careful not to peel up the silicone friction pads while you are sliding it into place. 4. Secure barrel band assembly, using m3 screw, by hand tightening until snug. Do not over-torque! DISCLAIMER: The purchase includes only the 3D-printed parts. All other objects in the photos are for reference only. USE this product at your own risk. EVOLVE 3D, LLC is not liable for damage to your property or person while using this product. WARRANTY: We offer a limited lifetime warranty on our 3D-printed parts.