Matthias Merzenich provided a monomer form which has cis-in, cis-out and trans isomers depending on the relative positions of the two blocks.
Mark Niemiec posted a 19-glider synthesis of the oscillator on January 13th.
Starting from an initial p24 gun by Tanner Jacobi, Matthias Merzenich found a way to adjust the sparkers (HW emulator, 44P12.3 and pipsquirter 1) to produce a true period gun with a slightly smaller bounding box than the previous record-holder, p24 gun. The population is somewhat larger, but this is not considered for most record-keeping purposes. The 44P12.3 and the pipsquirter 1 can each be placed in two possible orientations, allowing for the optimized P48 LWSS gun below.