Rezeroing the long guns for the New Year, I went to the rifle range. My friend Bill is handy, and for the last few months has been building a cannon (from scratch - he didn't make the wheels or the striker, but the rest is all him). Today he brought it out for the first firing.
(I filmed the second one - for some reason I decided to stand further away the first time):
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Impressive.
I assume he'll be bringing this to the next pro 2nd Amendment demonstration :-)
One word: canister...