Upgrading (Master-crafted) power weapon?

[Lautrec the Embraced]

If a character, let's say a Indomitus Terminator sarge, is equiped with a master-crafted power weapon, how does it affect legion specific weapon upgrade that goes like, I paraphrase, 'Any character with Legiones Astartes [...] that can take a power weapon may instead take [...] weapon'. Can you swap a MC power weapon in that way? (Also possible you can just swap your power fist, it is a 'power' weapon but not certain if it is the power weapon required...)

I'm thinking about swapping that particular power weapon for a chain glaive but the same idea could very well apply to phoenix spears, scythes... I believe the most likely scenario is  a 'no', as a MC [weapon] is not the same as [weapon], besides, what would happen to master-crafted after the upgrade...

On the other hand, with a more lenient approach, it doesn't seem to be such a nefarious breach of rules - you're replacing a better weapon than the one the rules allowed you to. Besides, master-crafted is a USR, right? There isn't I believe a separate weapon entry for 'MC Power sword' , so maybe it should be allowed to be swapped as it is just an augmented power weapon. 

So, wanted to inquire how more well-versed folks would approach this conundrum.

[Valkyrion]

I think this is the same answer as the Twin Linked question further down the HH rules page. 
There is no such thing as a Master Crafted Weapon, there are only weapons with the Master Crafted type. It sounds like semantics, and in a way it is, but a Power Sword is a Power Sword whether it's master crafted or not, just like a Heavy Bolter is still a Heavy Bolter even if it's twin linked. 

[Cactus]

To answer your other question, power fists, thunder hammers and lightning claws are all "Power" weapons and eligible to be swapped for chainglaives etc. It's in the armoury.

[SkimaskMohawk]

Yea, "master crafted power sword" is just shorthand for "power sword that has the master crafted special rule in addition to its other special rules".

It's not a unique sub-weapon, and any rules precedent that differentiated the two was from last edition. 

I'd say go for it, and chalk another one up on the list of "took 5 years of development time" lol.

[Lautrec the Embraced]

Thanks everyone, I haven't expected so much common sense in the rulebook

 

Edited July 31, 2022 by Lautrec the Embraced