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I'm thinking of getting a leman russ annihilator but the forgeworld model is pretty expensive and is supposed to be a krieg model. My plan is to use the basic leman russ model with hull lascannons and then possibly use a lascannon turret from a predator or maybe spare lascannons from a heavy weapons team. Any tips?

I believe you can easily find concertion bits for that, here's an example
https://bitsofwar.com/home/814-legionary-assault-tank-sponsons-lascannons.html
This fits more for rhino/l.raider, but you probably can find something more fitting to leman Russ.

If you want to to convert your own turret, check out the various sizes of lascannons you can find. Some are bigger than others, and work better (or worse) as turret weapons. The old Leman Russ hull lascannon is massive, the old Rogue Trader plastic ones are absolutely tiny, etc. I'm personally not a huge fan of the plastic Predator turret on a Russ body, but it would be the simplest option.

I did once see the original metal Predator Annihilator turret used on a Russ body, which looked very cool, but those are very hard to come by these days.