Hello, new poster here. I’m in the process of building my first pcc. Here’s my build list: - spike’s 9mm glock magazine - elf 9mm trigger - magpul fixed stock - jp scs - jp complete upper - trijicon mro I’m still waiting for the upper to be built. I️ should be getting it by mid December. In the meantime, is there anything else you guys would recommend? Have you guys tried out the spike’s lower? I️ built this for uspsa.