Pulsar used this mounting standard for many of their night vision and thermal rifle scopes in the past.
Pulsar Trail mounting standard on Pulsar Trail LRF XP50
The mounting surface features four screw holes, each with an M6 thread size.
*While this riflescope uses the Pulsar Trail mounting standard, its eye relief differs from that of the devices without the asterisk mark (*) on the list.
As a result, mount producers typically provide different mounting solutions for it.