APFG XM7 Steel Outer Barrel SetProduction run 1 14 05 26 A drop in steel replacement which greatly increases strength of the outer barrel. A relatively common issue on the APFG XM7 is snapping the outer barrel threads which is due to the poor quality zinc outer barrel and gas block piece. Gas block parts will need to be transferred over from the original APFG unit. Includes: Steel outer barrel and gas block M3*8mm Torx screw for the underside of the gas block (APFG screw often