How 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.

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 ...

This M4 loadout is about increasing control and accuracy to help this assault rifle work in all ranges. This build is lightweight, and it improves accuracy, though the lack of optic/scope has the ...