I put together a .260 rifle gas .750 steel gas block with Armalite rifle gas tube,M5 upper, Toolcraft BCG, and Armalite AR-10 recoil system. Sold it never had any complaints.
Mr. Mills https://www.jacksonville.com/story/news/military/veterans/2022/01/16/wwii-paratrooper-and-d-day-veteran-given-frances-highest-honor/9188662002/