THE FACT ABOUT COLT COMBAT UNIT RAIL GUN 45 THAT NO ONE IS SUGGESTING

Been clear of the board for a while as a consequence of marriage, home renovations and an old car resto, but I'm now acquiring back into firearms and specifically the AR15 form. So I guess which makes me an aged semi FNG.It's the early reciever with no fence round the mag launch and all early kind release pins with holes in the center. If you would