We believe you should not choose a cast AR 15 lower receiver for the following reasons: 1) They are weak. 2) They are ugly.
Most websites will tell you that it is ultimately your decision and that you should consider the pros and cons carefully before making your decision. We at Gun News Daily think it's helpful to include some examples of high-quality lowers and talk you about them. Then you can make an informed decision about the lower you need.
I've never used a cast receiver in any of my builds and would never recommend one to a fellow shooter. All that said, here are the top picks we've come up with.