Everything is custom. I don’t play anymore since I joined the Army. Build list is in photos and in the description. Works perfectly and is extremely snappy. Shoot me an offer. Base rifle was a G&P M4 with basic plastic furniture. I can include the original hand guard and such with the gun. Piston head: https://www.evike.com/products/70587/ Sorbo: https://www.evike.com/products/40904/ Neopad: https://www.evike.com/products/54524/ Mosfet: https://www.evike.com/products/64302/ Spring guide: https://www.evike.com/products/32580/ Screws: https://www.evike.com/products/43061/ Piston: https://www.evike.com/products/62386/ Shims: https://www.evike.com/products/29067/ Grease: https://www.brillarmory.com/index.php?main_page=product_info&products_id=412&zenid=a5bde610cfd387b72a1cac53635d7e9d Spring: https://www.brillarmory.com/index.php?main_page=product_info&products_id=152&zenid=a5bde610cfd387b72a1cac53635d7e9d Motor: https://www.brillarmory.com/index.php?main_page=product_info&products_id=1165&zenid=a5bde610cfd387b72a1cac53635d7e9d Bucking: https://www.brillarmory.com/index.php?main_page=product_info&products_id=151&zenid=a5bde610cfd387b72a1cac53635d7e9d Gears: https://www.brillarmory.com/index.php?main_page=product_info&products_id=300&zenid=a5bde610cfd387b72a1cac53635 Cylinder: https://www.brillarmory.com/index.php?main_page=product_info&products_id=420&zenid=a5bde610cfd387b72a1cac53635d7e9d Cylinder head: https://www.brillarmory.com/index.php?main_page=product_info&products_id=198&zenid=a5bde610cfd387b72a1cac53635d7e9d Barrel: https://www.brillarmory.com/index.php?main_page=product_info&products_id=180&zenid=a5bde610cfd387b72a1cac53635d7e9d