Interchangable Primaris Bits

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**Lance845**

Does anyone know which bits from the new primaris kits are interchangeable with regular marines?

I know the shoulders are supposed to be the same size. Are the heads? Backpacks?

I was considering grabing some bits for a conversion head but I wasn't sure how big their head was.

**JamesY**

Heads definitely are, I've switched them both ways.

**General Annoyance**

Shoulders, heads and backpacks should all be interchangeable. Arms, torsos and legs are out:

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.

From the Primaris Space Marines FAQ

**Lance845**

sweet. thanks

**GenRifDrake**

Yea heads and shoulder pads definitely are. Not 100% sure about the backpacks as Primaris packs are noticeably bigger than regular marine packs, but I think they'll still work fine if you just chop the contact point away and add them on.

Also, without meaning to hijack this thread too much, are the shoulder pads for Aggressors and Inceptors swapable with anything from vanilla marines? Are they just Terminator shoulder pad size or?