Thanks for info..but why seperate the uper and lower can you not just remove plug..I am new to the black guns and wanting to learn all I can
Why separate into two halves? Why wouldn’t you? It makes it much easier to work with as you don’t have the length of the barrel and or the width of the forearms to contend with. It’s also a preventative action on your part, you don’t want to accidentally scratch, ding or other damage your upper receiver. Remember, on the SIG this is the registered portion, in other words its means a new gun if damaged beyond repair.
As for a quad rail, the one I would recommend is this