Why do M16 and M4 users hit the left side of the gun after inserting a magazine? Is there some kind of button? - Quora
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Keadic 161Pcs Bolt Covers Screw Caps Plastic Nut Assortment Kit with Storage Box, M4 M5 M6 M8 M10 M12 Durable Nylon Insert Locknut for Matching Screws or Bolts, Black - - Amazon.com
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