I have 4 .223/5.56/300BLK Nitrided BCGs I got from Toolcraft and do not need. They are new and never been installed. 9310 MPI bolts, 8620 full auto carriers, staked gas key, o-rings are installed. Toolcraft produces a lot of BCGs for government defense contracts, and these are top notch. Price is $88 delivered. Money order or CC. PM or post with questions. Thanks!