So I purchased a Blazing Hog a few months ago, and it's a great gun. But I've been seriously thinking about buying a DMR or Sniper lately, and was curious to see how hard it would be to convert my G4-A2 into a dmr via an upper-receiver swap. I've been looking at all the other G4's, and was looking at what rail/outer barrel/inner barrel they where running, trying to determine how much it would cost. I was thinking about essentially building the upper receiver for the G4-A5 DMR, and was curious if anybody knew exactly what parts go into it? Thanks in advance, i'm still an Airsoft noob.