A Piston-Driven Civilian Version of the Legendary 416

The MR556A1 from H&K is a set standard for a piston-driven AR-15 Complete Upper. The MR556A1 is built with durability and reliability at the forefront. Starting from the inside out the Upper uses a short stroke gas piston arrangement that is meant to give this upper a better overall performance when compared to a traditional AR-15. The system is gassed to provide the best and most consistent operation. Precision machined aluminum receiver is meant to provide the best in potential accuracy. The free floating rail is light and adds a good amount of adaptability with its use of the M-Lok accessory system. And for some other nice ergonomic touches, this upper comes with an improved charging handle that makes for easier one-handed operation. The barrel is built with the same excellence you expect from H&K. Get an Upper that is made for getting through the rigors of the field and with the MR556A1.

Heckler& Koch MR556A1 Upper Kit Specifications and Features:

• Primary Weapon Systems item #: 81000584
• AR-15 Complete Upper
• 5.56 NATO (accepts .223 Remington and 5.56 NATO)
• 16.5" Barrel
• 1:7 Twist
• Short Stroke Gas Piston System
• A2 Flash Hider Muzzle Device
• 12" Free Float MLOK Handguard
• Improved Charging handle
• Aluminum Upper Receiver
• Proprietary Tungsten Filled Buffer Weight
• Piston Bolt Carrier Group
• Length 25.94"
• Weight: 6.2 lbs
• Black Finish