GOB, you might also try a fastener supply store for Ram Shot supplies, they and the Remington Ramset low velocity tool use 22 blanks to drive fastener pins into concrete. Just look for the lowest velocity cartridges since you just need noise.
Ed
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The three Rs: Respect for self; Respect for others; and responsibility for all your actions.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, almighty God! I know not what course others may take, but as for me, give me liberty, or give me death!"
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