Wasn't sure where to post this so move it wherever it belongs or delete it if it shouldn't be anywhere in this forum. I'm new to AR platform rifles and want to customize one. How do the gas system lengths relate to the rail system lengths? Can i put a rifle length rail system on a midlength gas system? Or a carbine length rail or a rifle length gas system? I get the differences in the gas systems themselves just not how they relate to the rail lengths. Thanks in advance.