This is the way i do it, may not be right but it has worked every time, put 20 round mag in it, lay flat on a table the flash hider will take a counter clockwise rotation. make sure the mag is on the table where the pressure will be put on it when you turn it. hang muzzle over the table a bit. think it takes a 3/4 inch wrench. do not use pliers or locking pliers. use a big wrench. i have a wrench extender i sometimes have to use. it makes it easier.. place your you left palm on the handguard and push down as you turn the wrench.