Well, the build looks great and sounded awesome as well. I am upgrading my M11 from A2 to M4 stock. It has a TASK slow fire conversion that utilizes the spring and buffer to slow the rate of fire. I am guessing it runs about 800 rpm with subsonic 9mm ammo. I will have to make sure that it functions okay with the M4 stock and then I may offer up the A2 stock for sale.
