From the YouTube channel Another Incarnation, a conversion of a Type 81 LMG to 6.5 Grendel DMR rifle. This was done using a donor barrel from a Ruger rifle and some kind of fiberglass shell for the stock. I think they are using a TI No-Drill Picatinny rail mount, but I'm not sure. Turn on auto-translation for translating the subtitles to English.
I didn't go through the entire video, but an interesting project, kudos on the work involved. The Grendel round should give a lot better performance at range then 7.62x39 mm. Anyone build an MCR or WK in Grendel yet? I remember RWA did a long barreled RWA180B build for a customer a while back.