Found a confirmed (not personally) negative about the M28; it seems that Echo 1 may have missed the boat when designing or redesigning the magazine for this rifle. Two M28 owners on the Airsoft Forum claim the magazines are cheap, and may have issues feeding. Read here:
http://www.airsoftforum.com/board/ECHO1 ... 03705.htmlThe only other negative noted at this time, is the rifle is heavy due to the build of the materials. I like weighty rifles, so weight is not always an issue.