First things first, the malfunction is an AMMO ISSUE. The round was improperly seated in the case and didn't chamber properly.
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https://www.youtube.com/watch?v=crmnPjuTQrU
Gunsmith Dave Sunturri demonstrates the defective internal lock of a Smith & Wesson Performance Center 686. Read the whole story at www.thetruthaboutguns.com
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https://www.youtube.com/watch?v=YaIidg3bnPc
If the bad guys force you to lie down getting to your gun and firing from that position is easy---once you know how. And practice. Read more at http://wp.me/pOQae-182j
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https://www.youtube.com/watch?v=NYcXe-dNR4o