Advice on setting FAL gas flow by the Director of Training for DSA (makers of FAL clones).

Not knowing that one can control gas-flow on this weapon has led to countless customer-service calls to DSA, complaining that the rifle ‘doesn’t work.’ The following is laid out in great detail in the Owners’s Manual, of course, but we are happy to explain to each owner how the gas-regulator works and then walk them through correct gas-regulator adjustment. Invariably, when we’re finished, like a miracle, the rifle suddenly runs fine! ….

More here.