Compared to the M4 , the M4A1 has full auto capability, a consistent trigger pull, and a slightly heavier barrel. The heavier barrel is more durable and has greater capacity to maintain accuracy ...
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Gray Zone Warfare: How to Build the Smallest SBR M4How to Build the SBR M4 in Gray Zone Warfare To build the Short-Barrel Rifle M4 in Gray Zone Warfare, you must first unlock Gunny level 2, which will unlock additional weapon attachments.
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