G36 Conversions

I've been using a G36K as my primary, and I love the system.  Over time I want to be able to convert it to fit the needs of my team back home, including installing an HPA JACK when possible.  Right now, the K variant works well for standard field games; however my team needs me to be their support gunner.  Our local field allows MG36s to be used as support weapons, which is important as everyone else has to fire semi-auto only.  Here is where things get tricky...

I have the Umarex G36KV(http://www.evike.com/products/37098/), and the OEM is ARES.  The inner barrel, handguard, and drum magazine are easy to find, but I am not sure what replacement outer barrels will fit.  I found this kit for the WE gas G36 (http://www.evike.com/products/37793/) that looks great, but I have no idea if the outer barrel will fit on.

Anyone have any recommendations for the conversion?  I don't know much about part compatibility between the WE kits and the Umarex/ARES weapons, but I know the handguard, inner barrel, and stock will work.