I am trying to replace the factory on/off muzzle brake with a suppressor. It is a direct threaded one with 5/8-24 threads. Problem is, the barrel isn’t a 5/8-16, nor is it a 9/16-24. It almost looks like a tapered pipe thread, but am not sure. I bought an adapter that won’t work now, anyone know what thread it is? It’s a fluted SS barrel in 300 WM. TIA!