Possibly the PVS22 ran mostly with the Leupy’s
Yep. My understanding is that Crane provided a contract for 600 systems around 2004 for the following items:
600 McCann MIRS rails
600 Universal Night Sights (UNS) aka AN/PVS-22
600 Leupold Mk 4, 3.5-10x40mm scopes
These were initially for SOCOM (Ranger Regiment and SF groups) who got these for their M24s. Soon thereafter the Navy procured the McCann rails for the 'M700/300 WinMag sniper rifles' which apparently became the Mk 13 Mod 0/1s when the rails were standardized. My understanding is that the system with the PVS-22 was designed for the Leupold MK 4 scopes, at least back in the 2004 time period. Not sure about the timeline re PVS-27 and prospective use on Mk 13s, as the NF scopes are a bit longer than the Leupold, so I will will defer to others regarding that topic.