http://www.dakkadakka.com/dakkaforum/posts/list/69.page JForum - http://www.jforum.net http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133170.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133170.page GMT Gen are 25 mm all the 1st and 2nd gen are 32 mm. Primarch on a big old oval base. ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133221.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133221.page GMT
Mine are on Sector Imperialis bases but I did like for like size swaps.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133309.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133309.page GMT
Neophytes are on 25mm bases, except for the ones with mining lasers, who go on 32mm bases.

Acolytes and Aberrants are on 32mm bases.

IIRC the Magus and Primus are inconsistent. I believe the DW:O box puts them on 25mm bases.
However they fit better on 32mm, and I think GW has shown them on 32mm in the past. Possibly the broodcoven box puts them on 32mm? Don't know anyone that has bought them separately from DW:O to confirm.

Yeah, the store page here shows them on 32mm bases. (my primus is on the 25mm that came with DW:O, and his feet touch each edge of the base)
https://www.games-workshop.com/en-US/Genestealer-Cults-Broodcoven]]> http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133315.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9133315.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9135482.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9135482.page GMT
I never got around to do the Neophyte Hybrids yet, so might stick them on the 25mm bases.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9135546.page http://www.dakkadakka.com/dakkaforum/posts/preList/714086/9135546.page GMT