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Are the kits compatible with existing Space Marine kits?
Good Question. There are certainly elements of the existing Space Marines kits that will be cross-compatible, while the new armour mark means that some parts won’t mix as easily. Shoulder pads and helmets are the same scale, and will still work, whereas the legs, torso and arms are different, and not quite as interchangeable. In terms of the Primaris sets themselves, you’ll have loads of fun kit-bashing them.