The very few times I played at Ravens I only took my M4 with a variable short dot - I never really needed all of the magnification and kept it on 1.5x most of the time. If it's just an AEG, then frankly a regular dot or holographic sight is enough and you won't need magnification. Ravens isn't a huge site anyway, but Gunman is a little larger and less forest-y (which I assume is the one you're on about too as it's the only one in Tuddenham). Either way, using a magnified optic is usually more hassle than it's worth and it's worth very little in most cases; it takes longer to aim with.
The G&P M2 style aimpoints are very rugged, and there are loads of brands that make holographic knock-offs too which you could go for. I think WE still get decent reviews for theirs.
I just bought a UTG 4.2" ITA after seeing some recommendations on here, but that was primarily because I've broken quite a few with blow back - on an AEG this isn't going to be much of an issue so go for what you like the look of. Those are quite cheap too if you look overseas.