About twelve years ago a good friend of mine was getting ready to clean his HK USP in the bedroom of his duplex. Well, the dork had a ND and shot into the mattress in the direction of the dividing wall of the duplex. I showed up about thirty seconds later to find him in a dead panic. He found where the 9mm bullet entered the mattress, but couldn't find the exit. Luckily no one was home next door so he breathed a sigh of relief that he hadn't shot someone. After some searching we finally found two exit holes in the mattress and eventually found both halves of the bullet in the closet.
So, yes a mattress can affect the path of a projectile, but only if it is lucky enough to hit one of those tiny wires. I'd say that it would be as effective as taking cover behind a chain-link fence in a gun fight.
Oh yeah, that friend of mine is now with the FBI and on their SWAT team. LOL! I laugh when I see him as I recall the video of the DEA agent shooting himself in the classroom.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin
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