Well, there's not $300 worth of upgrade parts in the UNC one, so the WGC version is a better deal.
On tht note, Mark Anderson of A&A Airsoft in Virden, Manitoba (see the retailer bar up top) has the exact same WGC custom M16VN in stock - it actually was imported right from WGC - and it's $650 CDN, not USD!
http://aasurplus.ca/airsoft/product_...roducts_id=103