The MK2 buffer (7.4oz) is offered as a stand alone option to tune AR pattern rifles that are already equipped with the MK2 recoil mitigation system. Allows fine tuning for optimal reliability and ejection pattern on rifles that are over gassed whether suppressed or unsuppressed. NOTE: only to be used as an upgrade to AR pattern rifles already using the MK2 Recoil Mitigation System.
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