I have been thinking about buying the G&G TR4-18. However I am not 100% sure I want blowback and not sure I want to take the time to replace the cylinder to get rid of it. So I would mostly like a gun that is an M4 variant, cqb length, have a RIS, and has a functional charging handle, bolt & release.
However if you know of a gun that is something a little different looking and uncommon feel free to suggest it and I will say what I like and don't like about it. Some other guns I do like are the G&G F2000, JG MK36K RIS and the G&G M14 HBA Short. My budget is about $500 so let's start suggesting.