So it's recoil operated like it's American counterpart the M1919A4 but it uses roller locking instead of a recoil accelerator to unlock the bolt from the barrel. That's pretty neat. You should do split screen comparison videos to show how similar most gun designs really are. Like how the M1 Garand and the AK-47/AKM share a very similar two lug rotating locking bolt design and both using long stroke gas piston operation. The M249 SAW and the PKM also share the same basic design except the PKM uses rimmed ammunition while the SAW doesn't so the belt feeds are a little different.