I do happen to have a BNL 01 NEW Sure-Cycle kit in the plastic, the same model listed at Brownells and others at $155 or so, plus shipping.
(I will ship this for $135.00 total)
This is the 19mm thread version (shoulder is about 13/16", but actual thread about .740", shoulder .825") that fits
Super Black Eagle
M1 Super 90
that have the corresponding thread size.
Email is best for me, please, rather than PM.