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I bought the box set Betrayal at Calth with the expressed purpose of adding the Space Marines contained therein to my Imperial Fists army. Are there any rules that prevent me from blending 30K Space Marines with 40K Space Marines?

I don't see why not, myself. It can't possibly be any worse than Tau or Eldar.

Martel732 wrote:
I don't see why not, myself. It can't possibly be any worse than Tau or Eldar.

What do you mean by that?

From a rules standpoint: yes. There are significant differences between any 30K force and their 40K brothers rules wise, so the two forces won't combine.
From a model standpoint: no. Everything in the B@C box has versions in both 30K and 40K, so can be used in a 40K SM army. As an example, 40K Red Scorpions are typically shown in variations of the Mk IV armor from B@C, Contemptors have rules (IA2E2), etc...

I think Martel thinks you mean blending rules, if you're just using the 30K models in 40K there's no issue.

Rules-wise yes, you'd have to pick either the 30K Legion rules, or the 40K C:SM rules, you can't use both together.

There is no mini in the BaC box that can not be represented in 40k.

The terminators might not get anything special for their model, IIRC in 30k, those particular ones are S&P, but with a 4++. But work just fine in 40k as either a shooty squad or a full lightning claw one. Fine as in legal under the codex, not touching effectiveness.

The dread can be fielded either as a MM or AsC armed one, with a powerfist w/stormbolter. Probably spring for the venerable upgrade. Contemptor dreads have distinct rules, but he can be fielded vanilla.

Tac squads going to tac squad. Besides a different aesthetic, these port over casually.

HQs are both legal builds for 40k guys. A little kitbashing make them a little more effective, but they can be played as-is.

 More Dakka wrote:
I think Martel thinks you mean blending rules, if you're just using the 30K models in 40K there's no issue.

Rules-wise yes, you'd have to pick either the 30K Legion rules, or the 40K C:SM rules, you can't use both together.

You are correct. I want to use the 30K models under 40K rules.

 TDS92A wrote:

 More Dakka wrote:
I think Martel thinks you mean blending rules, if you're just using the 30K models in 40K there's no issue.

Rules-wise yes, you'd have to pick either the 30K Legion rules, or the 40K C:SM rules, you can't use both together.

You are correct. I want to use the 30K models under 40K rules.

Yeah, that's even more unobjectionable. I thought you meant 30K legions vs 40K chapters.

No. I intend on painting them in the colors of the 3rd Company and building individual squads out if them.

It's quite fine to use those models in 40k. There are plenty of older suits of armor in a 40k chapter, many off the Marine boxes even includes elements of the older armor on the sprue. This just gives you lots of the older armor pieces

model wise: no, so long as you give them the correct guns the Fists would have plenty of MKIV and Cataphractii armor still even in the 41st Millenium
Rules wise: ohhh yes, the 30k list is leagues different then the 40k list

Having played 30k vs 40k several times, the overall power of 30k is quite a bit lower than 40k in most cases. So if you play 30k with 40k, against just 40k it may be an uphill battle.

None that I can find.

I noticed that the Bolters in the box set do not look like the 40K versions. Are they essentially the same weapon?

 TDS92A wrote:
I noticed that the Bolters in the box set do not look like the 40K versions. Are they essentially the same weapon?

Yes, and all the marks of power armor are just power armor.

Okay, good. I am now looking forward to building up my Imperial Fists with these. It should make for an impressive army. Just gotta hope that the dice rolls are equally impressive.