This kit contains all the necessary parts to mount to your Mil-Spec dimension stock assembly to your Mil-Spec lower receiver.
- MK2 Mod 1 - T0 Buffer (weight = approximately 3.8oz)
 - Mil-Spec M16A4 rifle action spring
 - Mk2 Receiver Extension (approximately 3/4” longer than carbine), 7076T6, 8 position, Mil-Spec diameter
 - Lock Nut (Castle) M4
 - Receiver QD End Plate (include mount for QD swivel)
 
SPECIFICATIONS
- Lessens felt recoil, without compromising reliability
 - Provides a more consistent carrier velocity, which can aid in accuracy, reliability over conventional carbine buffer system
 - Increased internal counterweight travel reduces bolt bounce
 - Internal spring to reduce noise of counter weight shifting and ensure more consistent weight placement
 - Mil-Spec M16A4 rifle spring with more spring coils than M4 carbine, increases consistency and widens operating envelope
 - Buffer made of 7075T6 aluminum, hard coat anodized for lasting endurance. Comprised of Mil-Spec components
 - BCM US Patent #10415907
 
