Muzzl velocity is 266 m/s which is about 870 fps
The data is public so we can discuss it. This is definitely a balanced valve, a larger caliber requires only a thicker valve rod. The question remains how to install the magazine here, maybe as in Huben or LCS ...
My first used of this system dates back to 2010, ie 12 years ago
Are you working with anyone in the States to be the importer for these rifles?