AR15 uppers will NOT fit on these lowers at all. You have zero chance of making a adapter.
Here is a couple pics showing where the mags hang up on my SA 14.3 carbine, from left to right.
modified RRA 10rd mag,factory RRA 10rd mag,factory Colt 5/20rd mag,P-mag 5/30,Brownells GI 5/30
Its the front squarness of some mags that cause the problems,notice the Pmags are tapered and the Colt mag has the square edges allready removed.
So you have to either take a small amount of metal from the SA upper trunion or remove the square shoulders from the magazines like I show in the picture ( first RRA mag pictured)
Here is a couple pics showing where the mags hang up on my SA 14.3 carbine, from left to right.
modified RRA 10rd mag,factory RRA 10rd mag,factory Colt 5/20rd mag,P-mag 5/30,Brownells GI 5/30
Its the front squarness of some mags that cause the problems,notice the Pmags are tapered and the Colt mag has the square edges allready removed.
So you have to either take a small amount of metal from the SA upper trunion or remove the square shoulders from the magazines like I show in the picture ( first RRA mag pictured)




























Even though I'm sure that I could handle the swapping of parts I'd still want a complete lower.





















