I live in NJ and have a 15rd max capacity. No hi-cap 15round mags available and the 126mm are either 10rds or 17rds. As I wanted to try an open setup, I'm stuck with 10 rounds. So, I was thinking of open steel where the 10 rounders would be fine for static and knockdown. If I go with 10 rounders, there's no capacity benefit to getting an STI 2011 hi-cap frame. So, my question is would I be able to take my current 1911 9mm or 40S&W single stack frame, put an open top end and drill/tap for optic mount? I'm worried that the frame is a bit thin for the optic mount. Thoughts?