Shot a sofa once when I was just a kid. Bought a wartime P-38. Seller said it was A-OK. Put one round in the mag, worked the action. Fed fine. Put the safety on. BANG! Safety had crystallized, hammer fell right through the block into the firing pin. Neat round hole in sofa. Neat round hole in wall behind sofa. Bullet went into furnace room, bounced around, missed everything. What we call a learning experience. NEVER trust mechanisms to do what they are supposed to do. The only real safety is between your ears.