Well as some of you may know, I was on the hunt for a gas tube for my M16A3 which I managed to source from johnnyj, I bought the front end from him with the tube & had an epiphany on the way to work yesterday.
I like to complete a 'series' of rifs/vinyl/other crap (I call it my tism) anyway... I realised I now had a carry handle upper and an M4 that was taking up space, so after a little dremelling I now have a DIY 723 carbine. Still needs a little tlc as the upper wasn't a straight swop & it needs an ejector cover and a forward assist but it'll do for now.
Just seen army stamped behind the selector so might be an AA