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Video is informative but it skips a lot of needed info such as trigger group dissassembly and re-assemble. Also it is mostly about using an aluminum receiver not a stamped steel receiver like most of them on the market, most of the information needed to properly weld in the cocking tube and trunion, attaching the front sight and pinning the new barrel into the trunion are skipped completely. If you are building our first HK it is worth watching but be prepared to spend a lot of time on the net searching for all the information you will need.