Here are several pictures of the ACE M4 MRE from SFOD set that I did. I never liked the solid moulded RAS, so this was what I decided to change on this rifle. I was able to disassamble ACE M4 to a point where I can work with it.
It's hard to see on the pictures, but rifle now has a full length barrel and gas blowback tube. I also gave it a new paint job. When I started weathering, small accident happened with too much paint going on rifle happened. Since it wasn't all that bad, I simply decided to make rifle look more weathered - I wonder if anyone will be able to catch where the spill happened