I personally like mp ICS MP5A4. Full metal body gives it some excelent weight and durability, and the latest version has a great gearbox and shoots quite nicely stock. For indoor, its a great CQB rifle due to its shorter length, and if you want to play outdoor just throw on a silencer and extended barrel, and drop in a new spring.
If you get the RIS conversion for it aswell, becomes very modular, with just as much practical rail space as a G36C anyway (as best as I can tell atleast...)
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