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I can't recommend a gun, but as for having an indoor vs outdoor gun, there's quite a few people that will run shorter guns (like an MP5, or a P90) outdoors.
If your primary concern for indoor/outdoor is the FPS, then it can be changed by swapping a $10/$15 spring.
If you're also concerned about the length of the gun, you can buy a longer gun, like a regular length M4, and then buy a $200 pistol and a handful of mags (if you get age verified, you'll get access to the classifieds, and you'll find quite a few good pistol+mag deals in there) for the tight areas.
If you're in it to win it, a tight little P90 that'll go around any corner in a CQB environment is really nice, but alternating from primary to secondary is just so much fun. =P
Anyway, just something to keep in mind. There's definitely guns you'll only want to use outdoors (eg an M14), and guns that you probably won't enjoy outdoors (eg an MP5k), but running an M4 or G36c is good for both indoor and outdoor.
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