Well if it's any consolation.... your not the first guy to do it. This type of thread comes up with an alarming regularity. So much so, that I hadn't read but the first four words and I knew exactly what the story was.
I really don't want this to sound like a flame, but young 14 year-old JD has a point. This sounds much more like playing than training. One piece of advice I learned 20 years ago after a stupid ND; fully clear the weapon EVERY TIME YOU PICK IT UP.
This seems to be the root cause of many of these incidents. I'm not being critical.... but rather, stone cold serious.
Training happens with deliberate planning and purpose and uses dedicated time, prioritized to avoid or ignore trivial distractions. Expecting an important call? Not a good time to attempt training. This kind of 'carpe diem' event may seem like training, but I'd have to catagorize it as "dinking around".
Though it certainly is tempting, I try to resist the temptation to dink around with guns. On the few occasions when I do, I'm extremely cautious.... check, double check... remove all ammo. from the area, check again, etc...
Either my paronoia or the Grace of God, has prevented a similar first hand experience.
I do know this.... if it happened to me, like it did to you.... I'd have the rock spackled and the door wood puddied with an ciche sign hanging over the hole in about two minutes flat
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Aprons, what aprons? They must have gotten lost in the move.