I made a lightweight portable stand out of pvc pipe. It's a square about 4x4 with t's at bottom of the square to put pvc legs shaped like t's into, so its free standing and easy to disassemble. I just tape sheets of cardboard to the square
frame.It has held up fine for many years now with no damage from any shot so far including hevi 4's.My nephew managed to hit it with a 9mm he was shooting and broke a piece, but it was a 10 minute fix, just replace the damaged pipe with a new one. The pipe is just slipped together, not glued, and held tight with duct tape, so it's easy to break down to fix if needed.