No point in switching out something that you can't use and will have to sell to BlackFace in the next year and a half. But if you really want to, a Dremel with a carbide rasp works well. The welds are more than just cosmetic for most of the m305s so you will have to take your time but most people just take off the grub screw, back off the nut a little and hit the flash hider with a blunt cold chisel. The welds are more brittle than the surrounding metal so it should fracture with a couple of hits. You can find tutorials on line. I've done it both ways and they are both the same level of difficulty. Keep in mind the m305s don't have a standard thread pitch.