When carrying an M16/M4-Type rifle in the field, there are a few components you should have. This is a list of the repair parts you should have on hand. The firing pin retainer pin is one of the most frequently lost. Although quite reliable, the gas rings can sometimes go as well. Every machine is prone to breakage at some point in its life cycle. Be prepared so your weapon does not go down, but if it does, you can get it back up and running in the field.
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