TIL that a Browning M2 50 caliber machine gun (AKA Ma Deuce) was in active US Army service for 87 years. It was only discovered to be that old due to it
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50 BMG « Daily Bulletin
Petition · Petition to Allow Big Bore Airgun Hunting in California ·
Indo Defense 2018] MP5 Clones, 7.62mm Rifles, News from Indonesia's Pindad -The Firearm Blog
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BAT action « Daily Bulletin