Good occupation MFI! I used to be hunting for a muzzle attachment that might however permit my CX4 Storm carbine to fit inside the factory plastic situation. Sierra Papa does a conversion that cuts off the inventory and converts it to just accept AR buffer tube stocks. I sent them https://claytontxzdh.ezblogz.com/58358247/9mm-muzzle-brake-1-2x28-an-overview