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I'm about to buy some of FW's new autocannons and Lascannons to make CSM Havocs with. Can anyone who has these tell me if you can use the standard CSM arms to attach them or do I need special arms for them?

They look like they'll fit. The MKIII arms you see here are pretty much the same as the Chaos Bolter arms. Go for it.

The back pack is where you'll have problems. The ammo box for the back pack only fits the MKII, III, and IV FW backpacks, easily. You can probably make it fit with green stuff or just leave off the ammo box and bullets.

Yeah the Autocannons look like they'll fit fine, but the lascannons could be a problem, most of the FW pics have the marines wielding them with the missile launcher left arm.

Indeed, the ammo packs fit the early mark armour only

However the MKIII etc armour isnt that much more than plastic - essentially the 5 havocs I have cost the same as GW Finecast, with the weapons i wanted and a better fit