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Which kits have weapons that are the same size as the weapons
on the War Walker sprue? I'm specifically looking at the Scatter
Lasers at the moment.

Heavy weapons platforms and wraithlords if I'm not mistaken. The weapons that come with the Wave Serpent are the right size but they need to be converted slightly in order to mount them on a walker.

The waveserpent weapons are a little different, but not much, and if you are using magnets anyway, its not a big deal. The warwalker weapons have a flat slot that plugs into a groove, while the waveserpent weapons have a hole that the turret peg mounts too. If you cut the hole off flat, then you will be able to mount it just like the warwalker weapons.

The Wave Serpent sprues are also only 4 dollars through mailorder, and come with every weapon, which is good for magnets.

The metal heavy weapon platforms and wraithlord also had a metal version of the newer scatterlaser that you could get as bitz, but it is 5 dollars for one apparently. Hmm.

BWB has scatter lasers that fit into the newer slot mounted weapons @ $3.29 a piece.

GW sells the wave serpent weapon sprue @4.00 and that sprue comes with one of each weapon.

If you really only need the scaser, then go BWB. If you want a whole turd load of weapons for a couple extra bucks, go with GW (though as stated above, they will need slight modification).

It's worth pointing out that it's not just the way it mounts that is different. The actual design of the weapons on the vehicle weapons sprue is different to that of the weapons on the walker and platform sprues.