This Is basically a process of grinding off the reinforcement product which was added to bolster the buffer tube/extension area, and reprofiling the region to really make it resemble the initial A1 region. This will likely consist of some welding or filling of some type. Use the pictures underneath for https://kylermnmjf.wikikarts.com/1074455/helping_the_others_realize_the_advantages_of_colt_m16a1_for_sale