Complete Kit Features:

• 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

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)

(PLEASE NOTE:  because of the MK2’s longer length some Mil-Spec stocks may not completely collapse closed all the way up to the M4 Lock nut.)