Originally Posted by Armalite
because, before install it, I wanted to know if it's just a bonus or it's a best protection against dust.
how sensitive is your charging handle release? I barely touch mine and the door falls. thus, I keep the port cover installed. Half the time I can't be bothered to flip the door up, so it's up to you. but to answer your question, it will help keep dirt and dust out. clearly not having it wouldn't be any better at protecting against dust.