The serial# does begin with MH. According to the serial # list on the old site this is a preban rifle. Doing some research I have found that Colt didn't ship this rifle with both the lug and FH. They shiped with the FH only from what I can see. Anyway I like the rifle very much! I guess the barrel was changed or the whole upper was changed. Is this a bad thing? I hope not! Also this thing about pins and what not. The reciever has 1 pin just above the grip and another right above and in front of the mag well, both the same diameter except the one near the mag well has a "head" on the right side with a flatened portion that rests against a raised fence around the mag well. Also this pin has small holes in the ends that would seem to be for a pin punch or something. On some Colts I have seen a screw in this position. Whats the difference, which is more desirable? I got this rifle on a whim, the deal just fell together, did I get a good rifle? I have a Bushmaster on order that will be here this week that would have been my first AR but like I said I just came across this so I'm naive about alot of the details.
Thanx for all the info keep it coming! This site is great!