That's my understanding.
I went back to check emails so let me walk back on part of my last reply regarding the R1T footprint.
"It [R1T] will be available in the same R1 footprint but for our M17 pistols and such we have a sight plate that makes everything fit cleanly. As for that rear sight plate that will be available very soon as well..."
I hope that helps.
The steel shroud should be available soon. No idea on the R1T."