This is basically a strategy of grinding off the reinforcement content that was added to improve the buffer tube/extension place, and reprofiling the region to make it resemble the first A1 region. This will involve some welding or filling of some type. Use the pictures underneath as an example: I've https://colt-combat-elite-defende90000.amoblog.com/the-single-best-strategy-to-use-for-colt-combat-elite-commander-45-acp-53173350