Centurion Arms LLC, 7.62 Billet Receiver Set in 7075-T6 Aircraft Grade AluminumKnights Armament pattern compatible 7.62 receivers Lower Receiver Specifications: Precision CNC from Billet 7075-T6 Aerospace Aluminum MIL-A-8625F, Type III, Class 2, Hard Anodized Flat Black Finish or Cerakoted per customers needs Compatible with standard AR Lower Receiver Parts, 7.62 takedown pin, DPMS pattern bolt catch, and bolt catch pin Dimensional Accuracy Inspection All Sharp Edges De-Burred Pictograph Selector Markings Properly Marked for 90A'Adeg Safety The largest Flared, Deep Beveled Magwell Integrated trigger guard All Components, material, and packaging made in the USA Weight: 9.5 oz Upper Receiver Specifications: Precision CNC from Billet 7075-T6 Aerospace Aluminum MIL-A-8625F, Type III, Class 2, Hard Anodized Flat Black Finish Compatible with TDP/Mil Standard AR Upper Receiver Parts All Components, material, and packaging made in the USA Weight: 11.3 oz stripped *** We recommend gunsmith installation for all of our parts. We cannot warranty items damaged by improper installation. **FFL REQUIRED BEFORE SHIPPING. Please contact your local FFL for transfer, and have them send a copy of their FFL to sales@centurionarms.com , and please have them reference your name/order number. No we do NOT accept fax as we live in the modern world and we also do NOT accept carrier pigeon. **