Bravo Company MK2 Recoil Mitigation System Mod 1 Receiver Extension Buffer Tube Kit contains all the necessary parts to mount to your Mil-Spec dimension stock assembly to your Mil-Spec lower receiver. FeaturesLessens felt recoil, without compromising reliabilityProvides a more consistent carrier velocity, which can aid in accuracy, reliability over conventional carbine buffer systemIncreased internal counterweight travel reduces bolt bounceInternal spring to reduce noise of counter weight shifting and ensure more consistent weight placementMil-Spec M16A4 rifle spring with more spring coils than M4 carbine, increases consistency and widens operating envelopeBuffer made of 7075T6 aluminum, hard coat anodized for lasting endurance. Comprised of Mil-Spec componentsKit IncludesMK2 Mod 1 BufferMil-Spec M16A4 rifle action springMk2 Receiver Extension (approximately 3/4" longer than carbine), 7076T6, 8 position, Mil-Spec diameterLock Nut (Castle) M4Receiver QD End Plate (include mount for Q...