In addition to a “function of the bring about” does not happen “automatically,” he insisted, mainly because “the shooter will have to continually and continuously thrust the force stock in the rifle ahead with his non-capturing hand though concurrently maintaining backward stress around the weapon together with his shooting hand.” https://machguns.com/product/lot-1450-auto-ordnance-a-range-1928-thompson-class-iii-nfa/