Originally Posted by mountainman13
Maybe this will help
Wow, that slide is pitted! In the first picture the color match looks normal so I'm guessing this isn't a parts gun.
Is it a blue steel slide and frame? And takes a 14, 15 or 17rd magazine? If so it's pretty much the cheaper version of the very rare all blue steel 5905. I have the common all SS 5906, which otherwise is the same as the 5905.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek