Is KWA M4 SIR INNER/OUTER Barrel Assembly compatible with KA INNER/OUTER Barrel Assembly ?

[5.56]

I have two M4 aegs. One is a KWA M4 SIR and the other is an ICS M4, modified with a King Arms CQB kit a while back by a gun doc.
I'd like to switch the barrel assemblies and, eventhough I've never done anything like this before, I think I should be able to do it after watching "how to" clips from Youtube.
Will I run into any compatibility problems here, or is this modification simple and easy for a guy who has never done this before?

THANKS.

[KND]

The inner barrel is probably compatible but for hop up unit won't be compatible. It's like 100 % not compatible due to the design of KWA M4 is using two piece TM hop up unit style so there is no way you can fit those in ICS body, you may fit one piece hop up with some modification but two piece is absolutely hell no.

As for inner barrel, as long as it's the same length. I don't think it has problem with ICS hop up unit. Hope it help.

Oh ! yeah, I forgot to mention ICS hop up unit is priority so it's one of the best hop up for M4 AEG. You should get a few of those if you can source, just in case your will break somehow.

KND

[5.56]

Hey, thanks for the tip.
What if I just purchase a 11.5 Outer Barrel and the matching inner barrel for my KWA SIR and leave the ICS alone, are there any specific outer barrel brands I should look for?