While SOCOM initially issued a request for information ... 300 Blackout upper receiver group (URG) and buttstock kit solution for the M4A1 platform,” according to Defense Media Network.
The M4/M4A1 5.56mm Carbine is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock. It is now the standard issue firearm for most ...
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