The "Tip" allows the blank to feed from a loaded magazine and run up the ramp as a normal round would do. It is hollow. When you fire the blank it breaks into a million small pieces and exits from the hole in the "BFA" ( Blank Firing Adapter).
We tested a few hundred at the "Barnaul" warehouse and found them to wok superbly.
For 7.62 blanks try Dan's Ammo He MAY have some?