You sure you don't mean the JLS SCAR? It's not any more difficult to work on, it's just different than other designs. Try to find a guide online on reassembly if you're having trouble.
The main reason to stay away from the JLS model is because it's made of crappy quality parts and doesn't look like a SCAR. The VFC model is the most realistic, and the CA SCAR isn't too bad either, just not as nice as the VFC.