The BCM MK2 Buffer Mod1 T3 is a 3.8oz standalone tuning buffer designed for AR pattern rifles already equipped with the MK2 recoil mitigation system. This precision-engineered buffer allows fine tuning for optimal reliability and ejection patterns on over-gassed rifles whether suppressed or unsuppressed.BCM MK2 Buffer Mod1 T3 - 3.8oz weightLessens felt recoil without compromising reliabilityProvides more consistent carrier velocity for improved accuracyIncreased internal counterweight travel reduces bolt bounceUses M16A4 rifle spring with more coils than M4 carbine for increased consistencyInternal spring reduces noise and ensures consistent weight placementMatte finish for durabilityEssential for AR rifle owners seeking to optimize their MK2 recoil mitigation system performance this buffer widens the operating envelope and enhances overall rifle reliability and accuracy.