Good day,
I made a hotfix for the current experimental build.
Just download the attached zip-file (contains a modified “art_magazines.json”), extract the “art_magazines.json”, replace the one in the mod folder and you’re done. 
Well, attachment doesn’t seem to be possible … so you have to make the hotfix by hand:
- Open the file “art_magazines.json” in the mod-folder.
- Search the following sentence:
{
"id" : "belt762R",
"type" : "MAGAZINE",
"name" : "7.62x54R ammo belt",
"description" : "An ammo belt consisting of metal linkages which disintegrate upon firing.",
"weight" : 0,
"volume" : 0,
"price" : 0,
"material" : "steel",
"symbol" : "#",
"color" : "ltgray",
"ammo_type" : "762R",
"capacity" : 200,
"count" : 100,
"rigid": false,
"linkage": "ammolink",
"reliability" : 6,
"armor_data" : {
"covers" : ["TORSO"],
"coverage" : 5,
"encumbrance" : 0,
"material_thickness" : 0
},
"flags": [ "NO_RELOAD", "NO_UNLOAD", "MAG_DESTROY" ]
},
- Replace it with this one:
{
"id": "ammolink762R",
"copy-from": "ammolink",
"type": "AMMO",
"name": "ammo belt linkage (762R)",
"use_action": {
"type": "ammobelt",
"belt": "belt762R"
}
},
{
“id”: “belt762R”,
“copy-from”: “magazine_belt”,
“type”: “MAGAZINE”,
“name”: “7.62x54R ammo belt”,
“ammo_type”: “762R”,
“capacity”: 200,
“count”: 100,
“linkage”: “ammolink762R”
},
- Save the modified file. Done.
Enjoy!