I can offer you the Archangel 597 kit. If the HG is installed properly, sits straight as an arrow.
Yes, all synthetic but the quality and molding is right up there with the Magpul kit most swap into their ARs. One of the strongest polymers in a kit I have used. If you trash this kit, you will likely have trashed an alum product.
Covered by a lifetime warranty too.
Fit is also rock solid.
Let me know...
Jerry