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These uppers will have a 6" 1:5 twist stainless barrel with micro pistol gas and lo pro gas block installed. It does not include BCG or charging handle. They also have our CAR-15 SD handguard assembly installed with Commando shroud and is 1.8" ID for tucking larger suppressors. The faster 1:5 twist will stabilize the 300+ grain subsonics better than the 1:8 and will have more rotational energy on target. One image shows a Q Short Chop suppressor installed for reference only.