The Necron Annihilation Barge and Catacomb Command Barge share a single plastic kit that builds either a twin tesla destructor gunboat or an Overlord-piloted command skimmer. Both variants ride a flying stem on a single base, so magnetizing the stand keeps the model swappable between the two builds without committing to one loadout.
Flight Stands for Annihilation Barge
To magnetize your Command Barge and Annihilation Barge, use the Large Posable - Medium. The flight stand will sit near the middle back in the hole and you need the extra height of the Medium.
[Buy Product=large40k,variant=all]
For a peel-and-stick option that works with clear flying bases, use the Peel & Stick Inner Base Magnets - no drilling required.
[Buy Product=flexible-self-adhesive-magnets,variant=51483453948194]
For a replacement base use the bases with magnets that have holes preset into them.
[Buy Product=bases-premagnetized-warhammer,variant=30427499626580]