HK416, MR556 Adjustable Gas Block - 11-20" A1 Barrels - NA5

Nefarious Arms - NA5 HK 416 Adjustable Gas Block

Nefarious Arm user configurable 2-position adjustable gas block compatible with 11″ – 20″ A1 MR556 and HK416 barrels.  Each gas block ships with 6 vent screws, a screwdriver, anti-seize, and detailed instructions.  These gas blocks are designed to use the rear pin slot on your barrel and cover the front pin slot.

Whether switching between suppressed and un-suppressed fire, or dialing in a forced reset type of trigger, this gas block gives you the ability to tune your rifle to cycle flawlessly.

Compatible With:

• HK416 A1
• HK416 A3
• HK416 A5
• HK416 A7 
• MR556 A1
• MR556 A4
• Other HK416 variants with the same barrel configurations as the above