Has anyone had a problem with their gun not cycling after installing a RSA trigger group? Mine seems to get really hard to move manually when the bottom of the Bolt Carrier makes contact with the hammer. I believe that it is just too hard for the gases to push...I have tried to polish those areas with no luck...
Anyways...
I was in the same boat as you are. I bought an ar lower and was looking for an upper when I realized I could buy a saiga .308 for less than a complete upper. I decided I would use the .308 cartridge a lot more than the .223. So now I have what is better for my applications; 7.62x39(plinking and some hunting) and .308(mostly hunting).