VERY COOL IDEA.
THEY HAVE researched and patented a great new IDEA of stackable shattering
Ceramic BALLS that stop ALL PISTOL AND RIFLE ROUNDS...(except maybe a 50 caliber, depending on what wall thickness you use?)
I THINK the hollow wall is 6" deep and they fill the space with ceramic BALLS
That drop by gravity once they explode from the ROUNDS hitting and refill that space...only problem is...under sustained fire...The top of The wall starts to "empty" since The BALLS are filling in below...kind of a flaw in my book.
Also a video on guys buying old ARMY
Ammo cans and filling them with
Smooth round river stone bags from home depot....almost as good as
SAAB TECHNOLOGIES RESULTS...
THEN THERE IS THE OLD "tried and true"
Sand bag approach...still works at three deep and Cris crossed correctly.