Squib
04 Jan 2020
300 AAC Blackout in a 5 56x45mm NATO Chamber
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In General
Safety first when handling firearms. This 5.56 x 45mm NATO upper receiver is junk now because the owner chambered a .300 AAC Blackout round in it by mistake. The sides are bulged out. Fortunately no one was hurt.
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Good info, you betcha all my mags are are marked.