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Ok a land raider moves 6" so can fire its main weapon - does this mean it can fire both TL lascannons? Is this the same for a predator with sponsons, or is the turret clearly the main weapon?
Thanks

There is no "main weapon" for any vehicle (except, in a way, the Leman Russ). Combat speed allow you to fire a single weapon and any defensive ones.
Each sponson is an individual weapon, meaning that the land raider an fire one of them. Of course, a land raider could fire one normal and the other with the power of the machine spirit.

The term 'Main Weapon' is a throwback to 4th Ed but is still used to determine how many weapons the vehicle can fire at any given movement speed, based on the strength of the weapons in question. The rules are on P58 of the BRB and describe the difference between them and 'Defensive' weapons.

Although OP; due to the Power of the Machine Spirit a Land Raider may move at combat speed and fire both T-L Lascannon sponsons(possibly even at different targets) But this is a special rule unique to all land Raider variants and Black Templar Vehicles with the PotMS upgrade.

As said Earlier the term "Main Weapon" no longer exists; it is simply a single weapon, and all defensive weapons(and defensive weapons are detailed on page 58 of the brb)

At least in DAs, the Machine Spirit fires with BS2. Does this change in later codices?

Newer marine codices do not suffer from bs2 on the potms, they instead fire the extra weapon at the bs of the land raider (4).

And Chaos lost their machine spirits completely with the newest codex... dang warp sucking up spirits!