Description Heckler & Koch MR556A1 chambered in 5.56x45mm with two, thirty round magazines and a 16.5″ cold hammer forged barrel with birdcage flash hider. The barrel has 6 lands/grooves with 1 in 7 inch right hand twist rifling. One magazine is a Eland metal magazine and the other is a factory new Magpul PMAG Gen M3 magazine. 12.5″ MLOK aluminum handguard. Full picatinny top rail with 48 sections. HK “closed” piston system. Standard AR-15 style controls. T-charging handle with extended latch. Magpul MOE polymer pistol grip. Adjustable polymer HK stock. Comes in its factory soft case with shipping box, manual, sticker, HK tool, lock, and two magazines. Must ship to a FFL holder. Check local laws regarding “Assault Weapons” and “High Capacity” magazines BEFORE bidding. H&K Condition: Factory New. Barrel Length: 16.5″ Serial: 241-407298 Manufacturer: HECKLER & KOCH Caliber: 5.56x45mm NATO Model: MR556A1 Book# 00571