Hi everyone. I'm looking to do a semi-build on a 9mm STI Spartan 4. Im wanting to replace the frame with a railed frame for light attachment (i.e. Caspian Recon frame). My question is.... 1. Is it worth the cost or should I just venture the route of a factory railed 1911? I plan using as many of the factory STI parts as I can unless I run into a fitting issue. Any knowledge or wisdom would be greatly appreciated. If anyone has any better suggestions or prior knowledge of a better path to take, please let me know before I dive into this one. Thanks