I have not used any Gunzilla on my firearms yet but it's got a lot of + internet buzz and was in use by many combat troops in SouthWest Asia(OIF/OEF).
It'd be safe for plastics or rubber but I'd wipe it off just like any other CLP.
I owned some LPX & used it often with my M&P. Ballistol is CFC free, non toxic & can be used on metal, polymer, rubber, wood, etc. It's a great product.