Heckler & Koch HK MR556 A1 5.56 NATO Semi-Auto Rifle with 16.5 inch CHF Heavy Barrel, Geissele SMR Rail, Magpul Stock, Flip-Up Sights, Threaded with A2 Flash Hider
This MR556 A1 is a civilian HK416-pattern rifle built around HK's short-stroke gas piston system, paired with a cold hammer forged heavy-profile barrel and high-quality aftermarket furniture. It features a Geissele Automatics Super Modular Rail HK (PN 05-190) installed, a Magpul 6-position carbine stock, and flip-up iron sights. The upper carries the HK proof mark with BF date code indicating 2015 production, and the bolt carrier is marked HK MR. Overall condition is excellent with a clean, mirror-finish bore.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Light handling marks consistent with mild use are present, but the rifle remains in great shape overall.
What’s Included
- 1x 30-round polymer STANAG-pattern magazine with clear window
- Geissele Automatics Super Modular Rail HK, 10.5 inch BBL (Extended) PN 05-190 — installed
- MOE-marked vertical foregrip — installed
- Magpul carbine stock — installed
- Flip-up front and rear iron sights — installed
The MR556 A1 uses HK's semiautomatic, short-stroke gas piston, rotating-bolt action, delivering the HK416-pattern operating system in a civilian configuration. The receivers are aluminum and include a continuous Picatinny top rail with T-mark numbers for consistent accessory placement. It accepts STANAG-pattern detachable magazines.
The 16.5 inch barrel is a heavy-profile, cold hammer forged, unchromed unit with a 1:7 twist to stabilize a wide range of 5.56mm projectiles. The muzzle is threaded and fitted with an A2 flash hider. The bore is clean with sharp rifling, consistent with the excellent condition noted.
A Geissele Automatics Super Modular Rail HK 10.5 inch BBL (Extended), PN 05-190, is installed. This aluminum handguard is designed for HK-pattern barrels and retains the HK barrel nut. A Magpul MOE vertical foregrip is mounted for additional front-end control.
The carbine-length Magpul stock is 6-position and collapsible, with a measured length of pull of 13.5 inches. The rifle retains HK-pattern textured polymer pistol grip, a standard magazine release, and a manual safety/selector. Flip-up front and rear iron sights are installed and ready for use.
Markings include an HK proof mark with BF date code on the upper (2015 production indication) and a Heckler & Koch Inc. Columbus GA roll mark. The bolt carrier is marked HK MR, consistent with MR-series components. One 30-round polymer magazine with a clear window is included.