I did already ask something similar before, but I realized later that by saying I wanted upgradeability, people thought I was talking about internals when really I meant adding scopes, lights, grips, etc. I did get some good sugestions but it seems like a ton of pretty good guns don't have a RIS and I don't want to spend $150 on a gun, then another $40 to add a RIS. The best I could find in my budget (under $200 for gun, battery, and charger) was this JG M4A1 SOPMOD. Not very many reviews though and I was wondering if anyone had something similar from a reputable brand and good enough internals for a starter gun. This would be my very first airsoft gun so I would like it to be a nice experience. Note: It doesn't have to be and M4, just don't want anything to long or heavy.