From
www.langdontactical.com:
NEW MOUNTING SOLUTION IN DEVELOPMENT AND COMING SOON!
We have been working hard to develop an optimized Red Dot mounting solution for the PX4 and we are now close to debuting that option - in the meantime the current Red Dot mounting solution will continue to be offered, but we recommend waiting if you can.
I'm damn near giddy. Lying. I'm flat out giddy. The last two holsters I ordered, from Black Rhino Concealment, are set up with the TLR7 AND an optics cut anticipating this magic moment.