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Everyone thinks that the M4A1 is the better gun. At long range, the M13 is top tier compared to the M4. The M13 (Sig Sauer MCX) is actually used by Special Forces. In my eyes, if the Spec Ops unit uses this gun, then it most be good for the Military to have a contract with Sig Sauer. What do you...
Someone may have mentioned this, but what rifle is the M13 based on. To me, it looks like the HK416. That's a sick gun. What rifle wins, M4A1 or the M13?