x = 31, y = 31
19bo$17b3o$16bo$16boo$30bo$28b3o$27bo$27boo5$20boo$19bobo$19bo$19boobo
$bboo17boo$bobo$bo$oo8$6boo$5bobo$5bo$4boo!
A period 184 double-barrelled glider gun based on one B-heptomino.
Unlike previous glider guns, the reaction flips on a diagonal so that
both gliders travel in the same direction.
David Buckingham, July 1996