Howdy. I'm new to this forum, but not new to airsofting. I'm looking to build a polarstar AR. I would like it to have a slim / light weight rail system like my RS. This would mean a rail with modular pic rail panels that either screw into place or use a sort of keymod system. Since I'm going to put a fusion engine in it, I don't want to waste money on something as expensive as a krytec, and I want to avoid having fitting issues with putting a RS rail system on an airsoft model. Can someone please suggest a gun?