No, old friend, our orange commander and NRA and BATFE declared by fiat that we can't have the bumpy toys. If you have yours, it is supposedly a felony. I think they would have the burden of proving that their administrative action redefining the enacted statutory language is in fact legal, but I ain't interested in being the test case on that.
Breaching rounds are usually sintered lead powder. I have seen them at places like SGAMMO if you want some.