Andy,
BT grenades would be relatively easy to manufacture, probably as easy as hand grenades. Perhaps less as they just need an impact fuse, not a timed fuse.
For these particular rifle grenades (Bullet Trap or Bullet Through) there is no propellant, rocket motor or special Ballistite cartridges needed, an ordinary bullet will do. Practice is a lot easier than other grenade launchers because all that is expended is a bullet as BT grenades are recoverable.
The Yugoslavs (including the Serbs) use them extensively, and it wouldn't be difficult to copy them. However, doing some reading, I can't see references to the Kalashnikov-series rifles having grenade adapters built in, so that might have to be a latter modification.
Tony
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