-Material: Steel-Hardness: HRC 40ﾟ (Sear set,Trigger,Hammer,Bearing Hammer)-For WA M4A1 SeriesIncluded:-Burst Sear set-Burst Sear Spring-Burst Trigger-Burst Trigger pin-Burst Hammer-Burst Hammer spring-Burst Hammer lock-Burst Hammer lock Pin-Burst Hammer lock Shim-Burst Selector Pin-Burst Bearing Hammer
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