Has anyone been able to get their hands on the TLR7 Sub 1913 variant? It looks like the rail interface is narrower than a typical 1913 rail, but hard to tell because most of the pictures for this thing are generic photos. Can anyone who has been able to get their hands on one elaborate on the width of the rail interface? Will it lock up with standard width (double column style pistols) or is this thing solely designed for slim rails? Thanks.