Dear John M. I plan on building a SRSG with 6AL4V titanium slugs that they throw out at my work. Two reasons, They say it can't be done because it will burn like fireworks, and I love wasting my time proving others WRONG. Also it's rock free to me and anyone else who wants to try it. Send me Some E-mail and I will send you some if you pay the postage. Denis Despins KC6TRW