Airsoft net for point blank shots.
Here is the problem: Airsoft net can not stop point blank shots and still allow you to see through it.
Solution: Airsoft plastic shield. Stops all point blank shots at virtually any FPS or weight of bb.
Now you can get the protection you need and still allow the spectators to see.
Price is for a 12' x 50' sheet. If this doesn't fit your price point, try a wooden wall with plexiglass windows.