Originally Posted by ThunderCactus
you may lose the ability to reliably use your AEG in the rain
MAY lose the ability to use in the rain.
My 249's TM is under the feed tray cover so it doesn't get wet, it's in a sealed AN-PEQ on my M4
But if your mounting in inside a handguard, or somewhere water can get to, it probably won't last out a rain game.
And covering it with something can be a bad idea, these things can get hot on certain setups and they need airflow to cool down, especially during excessive semi auto fire.
But you can always take the heatshrink off if you find it overheats too often!