well alot of people I've noticed have had issues with shoot soft and buyairsoft, though buyairsoft is under new managment (apparently C.A.S bought them out but don't quote me on that)
as for guns, if your looking for a good close quarters gun, look into the MP5 serries they're rather compact as well as the P90.
take a look at some of the models that interest you, personally i'd go with a M4 due to the fact its got alot of externals available, though that is my own opinion.
and now to play the same tune alot of people will. are you 18? get age verified and then scour the classifieds you'll fine a tonne of sweet guns.
"You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."