Heckler & Koch MR556 Upper Receiver Kit, 16.5" M-LOK

Description: Heckler & Koch MR556 Upper Receiver Kit, 16.5" M-LOK. This Heckler & Koch Upper Receiver kit is manufactured for H&K MR556 rifles chambered in .223 Rem and 5.56x45mm. This kit includes a completed upper receiver with forward assist, 16.5" cold hammer-forged barrel, left-side release charging handle, bolt carrier assembly and a buffer / buffer spring allowing most high-quality 5.56mm AR-style rifles to be retrofitted to HK's pusher rod system. This assembly has an HK free-floating M-LOK handguard with seven attachment sides and a top MIL-STD-1913 Picatinny rail. This premium machined alloy handguard allows all current accessories such as sights, lights and lasers to be fitted. Also included is a black tactical carrying case featuring PALS webbing and pouches with the HK logo front and center. This upper receiver kit is the core of the HK 5.56mm proprietary gas piston operating system.

Kit Includes:

• Complete MR556 Upper Receiver/Barrel Assembly
• Complete MR556 Bolt Group Assembly
• Tungsten Filled HK Proprietary Buffer
• HK Proprietary Buffer (Action) Spring
• Tactical HK Carrying Case

Features:

• 16.5" Cold Hammer-Forged Barrel
• 12.5" M-LOK Free Floating Handguard
• 18.5" Top Picatinny Rail
• Charging Handle w/ Left-Side Release
• HK Piston-Driven Operating System
• Birdcage-Style Flash Hider
• Compatible w/ Semi-Auto Lowers Only

Manufacturer: Heckler and Koch

PRODUCT SPECIFICATIONS:

• Barrel Length: 16-1/2"
• Barrel Thread Pitch: 1/2" x 28 TPI
• Brand: Heckler and Koch
• Caliber: 5.56x45mm,.223 Rem
• Finish / Color: Black
• Firearm Type: Rifle
• Material: Aluminum,Steel
• Models Fit: HK MR556A1,AR-15