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hk mr 556 a1

  1. HK MR556A1 barrel cut & gas block help

    HK ROOKIE CORNER
    Hey dudes. I'm not new to HK guns, or even the MR556A1/416, but I am new to modding them in major ways, specifically barrel cutting. I recently bought a HK CR556A1 that I intend to cut to 12.85 inches, put a Geissele 10.5 SMR, BCM Gunfighter Sopmod stock, Trijicon Accupower 1-4 (holdover until...
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