With the advent of the calth box, it's a deal too good to pass up. My problem is that I would like to have a chapter 40k for an ongoing storyline. How far fetched would it be for a chapter to have a large portion, if not half of their armoury be made up of mkIV armour? Red Scorpions need not apply, I like camo cloaks for scouts.
Would it be stretching it to have a chapter, whether canon chapter or diy, with lots of mkIV? What chapters outside the Red Scorpions would this suit?
Minotaurs also have large amounts of Mk IV.
Any of the major first founding chapters, as well as most second founding chapters like Black Templars, Novamarines, etc will have vast armories and strong ties to the original legions.
The good thing about legion Mk IV is that it is covered with various random mismatched parts and armor bonding studs, to represent the fact that this wasn't a legion of 10,000 identical soldiers. They had various damage, replacements, modifications, and repairs made to their suits over the coarse of the Crusade.
So while it may be slightly eyebrow raising to see an army of pure Mk IV in 40K, at the very least, it's not pristine Mk IV and has various studs on them. You can create battle damage too to make it realistic.
Mk IV is not a lost technology, it is simply limited to a very few select Forge Worlds. If your chapter has a strong tie to one of these FWs, or happens upon a large cache of Mk IV, it wouldn't be unreasonable to say you had a large amount of marines in it. Your army doesn't represent the whole chapter. Maybe you are playing a group from the esteemed X/Y/Z Company who happened to have most of the suits.
This is what I was considering
This was a really great response and gave me a lot to think about in terms of the why and how, fluffing a reason for them to have it would 'legitimize' it, if only in my own eyes
The Consecrators Chapter of the Dark Angels has a shitload of relic equipment ranging from loads of old armor models and old version of bolters and relic gear.
They literally are "Relic Gear the Chapter".
genuinely tempting, but I would go one step sidweways. Have them come out say, 38k, then by the 41st they're more or less a true modern chapter...albeit with a lot more heresy tech.
Trapped in the warp homebrews are lame and stupid copouts trying to shoehorn in a shaky idea.
If your idea was really solid it wouldn't require Warp shenanigans. That's female space marine tier stuff. Not to mention all the "30k to 40k trapped in the warp" crap people spam online, when actual canon examples of warp time jumps never go as far back as 30k.
I think now that GW have bought out betrayal at Calth, we're going to see a lot more art and mention of Space Marines wearing MK IV in 40k
There were roughly a million space marines in great crusade who stayed loyal.
There are currently about a million space marines in the 40k imperium.
With how well they treat their armour, I doubt it's going to be THAT rare to see heresy-armour marks.
While many good canon suggestion have been made in the thread, a homebrew chapter with a lot of older Mks of armour or just a lot of Mk 4 is perfectly plausible. It's not one of those wince-worthy stereotypes like female marines or marines-who-are-like-super-reasonable-you-guys. It's simply a fun, interesting quirk. Go nuts.
They found then in some lost moon, the ship got lost in warp in M31 and crashed into it. They belonged to some loyalist chapter (to avoid extra flakeness) but said: found it, keep it.