First the barrel, then the bolt

    Solider Systems published this PEO Solider PowerPoint slide showing the phases of the M4A1 Carbine upgrade. First the barrel, trigger and fire controls will be upgraded, followed by the rail system, bolt and bolt carrier.

    [ Many thanks to Lance for emailing me the link. ]

    Steve Johnson

    I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!