12-barrelled p136 glider gun A 12-barrelled, period 136 glider gun, using 29 B-heptominoes moving around a p3944 track consisting of 16 of David Buckingham's 64 gen turns and 40 of his 73 gen turns. This is the smallest possible period that can be obtained using Buckingham's turns. Any larger multiple of 8 can also be obtained as a gun period. dean@ucdmath.ucdavis.edu 11/23/91Xref: bhepto track